diff --git a/src/pmod_pt.erl b/src/pmod_pt.erl
new file mode 100644
index 0000000..db21974
--- /dev/null
+++ b/src/pmod_pt.erl
@@ -0,0 +1,461 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2013. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%%
+%% %CopyrightEnd%
+%%
+
+-module(pmod_pt).
+-export([parse_transform/2,
+	 format_error/1]).
+
+%% Expand function definition forms of parameterized module.
+%% The code is based on the code in sys_expand_pmod which used to be
+%% included in the compiler, but details are different because
+%% sys_pre_expand has not been run. In particular:
+%%
+%% * Record definitions are still present and must be handled.
+%%
+%% * (Syntatic) local calls may actually be calls to an imported
+%%   funtion or a BIF. It is a local call if and only if there
+%%   is a definition for the function in the module.
+%%
+%% * When we introduce the module parameters and 'THIS' in each
+%%   function, we must artificially use it to avoid a warning for
+%%   unused variables.
+%%
+%% * On the other hand, we don't have to worry about module_info/0,1
+%%   because they have not been added yet.
+
+-record(pmod, {parameters,
+	       defined
+	      }).
+
+parse_transform(Forms0, _Options) ->
+    put(?MODULE, []),
+    Forms = transform(Forms0),
+    case erase(?MODULE) of
+	[] ->
+	    Forms;
+	[_|_]=Errors ->
+	    File = get_file(Forms),
+	    {error,[{File,Errors}],[]}
+    end.
+  
+format_error(extends_self) ->
+    "cannot extend from self";
+format_error(define_instance) ->
+    "defining instance function not allowed in parameterized module".
+
+add_error(Line, Error) ->
+    put(?MODULE, get(?MODULE) ++ [{Line,?MODULE,Error}]).
+
+get_file([{attribute,_,file,{File,_}}|_]) -> File;
+get_file([_|T]) -> get_file(T).
+    
+transform(Forms0) ->
+    Def = collect_defined(Forms0),
+    {Base,ModAs,Forms1} = attribs(Forms0, [], undefined, []),
+    {Mod,Ps0} = case ModAs of
+		    {M0,P0} -> {M0,P0};
+		    M0 -> {M0,undefined}
+		end,
+    Forms2 = case Ps0 of
+		 undefined ->
+		     Forms1;
+		 _ ->
+		     pmod_expand(Forms1, Mod, Base, Ps0, Def)
+	     end,
+
+    %% Add new functions.
+    NewFs0 = maybe_extend(Base, Mod, Ps0),
+    NewExps = collect_defined(NewFs0),
+    Forms3 = add_attributes(Forms2, [{attribute,0,export,NewExps}]),
+    add_new_funcs(Forms3, NewFs0).
+
+pmod_expand(Forms0, Mod, Base, Ps0, Def) ->
+    Ps = if is_atom(Base) ->
+		 ['BASE' | Ps0];
+	    true ->
+		 Ps0
+	 end,
+    St0 = #pmod{parameters=Ps,defined=gb_sets:from_list(Def)},
+    {Forms1,_} = forms(Forms0, St0),
+    Forms2 = update_exps(Forms1),
+    Forms3 = update_forms(Forms2),
+    NewFs0 = add_instance(Mod, Ps, []),
+    NewFs = ensure_new(Base, Ps0, NewFs0),
+    Forms = add_new_funcs(Forms3, NewFs),
+    NewExps = collect_defined(NewFs),
+    add_attributes(Forms, [{attribute,0,export,NewExps}]).
+
+add_attributes([{attribute,_,module,_}=F|Fs], Attrs) ->
+    [F|Attrs++Fs];
+add_attributes([F|Fs], Attrs) ->
+    [F|add_attributes(Fs, Attrs)].
+
+add_new_funcs([{eof,_}|_]=Fs, NewFs) ->
+    NewFs ++ Fs;
+add_new_funcs([F|Fs], Es) ->
+    [F|add_new_funcs(Fs, Es)].
+
+maybe_extend([], _, _) ->
+    %% No 'extends' attribute.
+    [];
+maybe_extend(Base, _Mod, undefined) ->
+    %% There is a an 'extends' attribute; the module is not parameterized.
+    Name = '$handle_undefined_function',
+    Args = [{var,0,'Func'},{var,0,'Args'}],
+    Body = [make_apply({atom,0,Base}, {var,0,'Func'}, {var,0,'Args'})],
+    F = {function,0,Name,2,[{clause,0,Args,[],Body}]},
+    [F];
+maybe_extend(Base, Mod, Ps) ->
+    %% There is a an 'extends' attribute; the module is parameterized.
+    Name = '$handle_undefined_function',
+    Args = [{var,0,'Func'},{var,0,'Args'}],
+    DontCares = [{var,0,'_'} || _ <- Ps],
+    TuplePs = {tuple,0,[{atom,0,Mod},{var,0,'BaseVars'}|DontCares]},
+    G = [{call,0,{atom,0,is_atom},
+	  [{call,0,{atom,0,element},
+	    [{integer,0,1},{var,0,'BaseVars'}]}]}],
+    FixedArgs = make_lists_rev([{var,0,'Rs'},
+				{cons,0,{var,0,'BaseVars'},{nil,0}}]),
+    Body = [{'case',0,make_lists_rev([{var,0,'Args'}]),
+	     [{clause,0,[{cons,0,TuplePs,{var,0,'Rs'}}],[G],
+	       [make_apply({atom,0,Base}, {var,0,'Func'}, FixedArgs)]},
+	      {clause,0,[{var,0,'_'}],[],
+	       [make_apply({atom,0,Base}, {var,0,'Func'}, {var,0,'Args'})]}
+	     ]}],
+    F = {function,0,Name,2,[{clause,0,Args,[],Body}]},
+    [F].
+
+make_apply(M, F, A) ->
+    {call,0,{remote,0,{atom,0,erlang},{atom,0,apply}},[M,F,A]}.
+
+make_lists_rev(As) ->
+    {call,0,{remote,0,{atom,0,lists},{atom,0,reverse}},As}.
+
+ensure_new(Base, Ps, Fs) ->
+    case has_new(Fs) of
+	true ->
+	    Fs;
+	false ->
+	    add_new(Base, Ps, Fs)
+    end.
+
+has_new([{function,_L,new,_A,_Cs} | _Fs]) ->
+    true;
+has_new([_ | Fs]) ->
+    has_new(Fs);
+has_new([]) ->
+    false.
+
+add_new(Base, Ps, Fs) ->
+    Vs = [{var,0,V} || V <- Ps],
+    As = if is_atom(Base) ->
+		 [{call,0,{remote,0,{atom,0,Base},{atom,0,new}},Vs} | Vs];
+	    true ->
+		 Vs
+	 end,
+    Body = [{call,0,{atom,0,instance},As}],
+    add_func(new, Vs, Body, Fs).
+
+add_instance(Mod, Ps, Fs) ->
+    Vs = [{var,0,V} || V <- Ps],
+    AbsMod = [{tuple,0,[{atom,0,Mod}|Vs]}],
+    add_func(instance, Vs, AbsMod, Fs).
+
+add_func(Name, Args, Body, Fs) ->
+    A = length(Args),
+    F = {function,0,Name,A,[{clause,0,Args,[],Body}]},
+    [F|Fs].
+
+collect_defined(Fs) ->
+    [{N,A} || {function,_,N,A,_} <- Fs].
+
+attribs([{attribute,Line,module,{Mod,_}=ModAs}|T], Base, _, Acc) ->
+    attribs(T, Base, ModAs, [{attribute,Line,module,Mod}|Acc]);
+attribs([{attribute,_,module,Mod}=H|T], Base, _, Acc) ->
+    attribs(T, Base, Mod, [H|Acc]);
+attribs([{attribute,Line,extends,Base}|T], Base0, Ps, Acc) when is_atom(Base) ->
+    Mod = case Ps of
+	      {Mod0,_} -> Mod0;
+	      Mod0 -> Mod0
+	  end,
+    case Mod of
+	Base ->
+	    add_error(Line, extends_self),
+	    attribs(T, Base0, Ps, Acc);
+	_ ->
+	    attribs(T, Base, Ps, Acc)
+    end;
+attribs([H|T], Base, Ps, Acc) ->
+    attribs(T, Base, Ps, [H|Acc]);
+attribs([], Base, Ps, Acc) ->
+    {Base,Ps,lists:reverse(Acc)}.
+
+%% This is extremely simplistic for now; all functions get an extra
+%% parameter, whether they need it or not, except for static functions.
+
+update_function_name({F,A}) when F =/= new ->
+    {F,A+1};
+update_function_name(E) ->
+    E.
+
+update_forms([{function,L,N,A,Cs}|Fs]) when N =/= new ->
+    [{function,L,N,A+1,Cs}|update_forms(Fs)];
+update_forms([F|Fs]) ->
+    [F|update_forms(Fs)];
+update_forms([]) ->
+    [].
+
+update_exps([{attribute,Line,export,Es0}|T]) ->
+    Es = [update_function_name(E) || E <- Es0],
+    [{attribute,Line,export,Es}|update_exps(T)];
+update_exps([H|T]) ->
+    [H|update_exps(T)];
+update_exps([]) ->
+    [].
+
+%% Process the program forms.
+
+forms([F0|Fs0],St0) ->
+    {F1,St1} = form(F0,St0),
+    {Fs1,St2} = forms(Fs0,St1),
+    {[F1|Fs1],St2};
+forms([], St0) ->
+    {[], St0}.
+
+%% Only function definitions are of interest here. State is not updated.
+form({function,Line,instance,_Arity,_Clauses}=F,St) ->
+    add_error(Line, define_instance),
+    {F,St};
+form({function,Line,Name0,Arity0,Clauses0},St) when Name0 =/= new ->
+    {Name,Arity,Clauses} = function(Name0, Arity0, Clauses0, St),
+    {{function,Line,Name,Arity,Clauses},St};
+%% Pass anything else through
+form(F,St) -> {F,St}.
+
+function(Name, Arity, Clauses0, St) ->
+    Clauses1 = clauses(Clauses0,St),
+    {Name,Arity,Clauses1}.
+
+clauses([C|Cs],#pmod{parameters=Ps}=St) ->
+    {clause,L,H,G,B0} = clause(C,St),
+    T = {tuple,L,[{var,L,V} || V <- ['_'|Ps]]},
+    B = [{match,L,{var,L,'_'},{var,L,V}} || V <- ['THIS'|Ps]] ++ B0,
+    [{clause,L,H++[{match,L,T,{var,L,'THIS'}}],G,B}|clauses(Cs,St)];
+clauses([],_St) -> [].
+
+clause({clause,Line,H,G,B0},St) ->
+    %% We never update H and G, so we will just copy them.
+    B1 = exprs(B0,St),
+    {clause,Line,H,G,B1}.
+
+pattern_grp([{bin_element,L1,E1,S1,T1} | Fs],St) ->
+    S2 = case S1 of
+	     default ->
+		 default;
+	     _ ->
+		 expr(S1,St)
+	 end,
+    T2 = case T1 of
+	     default ->
+		 default;
+	     _ ->
+		 bit_types(T1)
+	 end,
+    [{bin_element,L1,expr(E1,St),S2,T2} | pattern_grp(Fs,St)];
+pattern_grp([],_St) ->
+    [].
+
+bit_types([]) ->
+    [];
+bit_types([Atom | Rest]) when is_atom(Atom) ->
+    [Atom | bit_types(Rest)];
+bit_types([{Atom, Integer} | Rest]) when is_atom(Atom), is_integer(Integer) ->
+    [{Atom, Integer} | bit_types(Rest)].
+
+exprs([E0|Es],St) ->
+    E1 = expr(E0,St),
+    [E1|exprs(Es,St)];
+exprs([],_St) -> [].
+
+expr({var,_L,_V}=Var,_St) ->
+    Var;
+expr({integer,_Line,_I}=Integer,_St) -> Integer;
+expr({float,_Line,_F}=Float,_St) -> Float;
+expr({atom,_Line,_A}=Atom,_St) -> Atom;
+expr({string,_Line,_S}=String,_St) -> String;
+expr({char,_Line,_C}=Char,_St) -> Char;
+expr({nil,_Line}=Nil,_St) -> Nil;
+expr({cons,Line,H0,T0},St) ->
+    H1 = expr(H0,St),
+    T1 = expr(T0,St),
+    {cons,Line,H1,T1};
+expr({lc,Line,E0,Qs0},St) ->
+    Qs1 = lc_bc_quals(Qs0,St),
+    E1 = expr(E0,St),
+    {lc,Line,E1,Qs1};
+expr({bc,Line,E0,Qs0},St) ->
+    Qs1 = lc_bc_quals(Qs0,St),
+    E1 = expr(E0,St),
+    {bc,Line,E1,Qs1};
+expr({tuple,Line,Es0},St) ->
+    Es1 = expr_list(Es0,St),
+    {tuple,Line,Es1};
+expr({record,Line,Name,Is0},St) ->
+    Is = record_fields(Is0,St),
+    {record,Line,Name,Is};
+expr({record,Line,E0,Name,Is0},St) ->
+    E = expr(E0,St),
+    Is = record_fields(Is0,St),
+    {record,Line,E,Name,Is};
+expr({record_field,Line,E0,Name,Key},St) ->
+    E = expr(E0,St),
+    {record_field,Line,E,Name,Key};
+expr({block,Line,Es0},St) ->
+    Es1 = exprs(Es0,St),
+    {block,Line,Es1};
+expr({'if',Line,Cs0},St) ->
+    Cs1 = icr_clauses(Cs0,St),
+    {'if',Line,Cs1};
+expr({'case',Line,E0,Cs0},St) ->
+    E1 = expr(E0,St),
+    Cs1 = icr_clauses(Cs0,St),
+    {'case',Line,E1,Cs1};
+expr({'receive',Line,Cs0},St) ->
+    Cs1 = icr_clauses(Cs0,St),
+    {'receive',Line,Cs1};
+expr({'receive',Line,Cs0,To0,ToEs0},St) ->
+    To1 = expr(To0,St),
+    ToEs1 = exprs(ToEs0,St),
+    Cs1 = icr_clauses(Cs0,St),
+    {'receive',Line,Cs1,To1,ToEs1};
+expr({'try',Line,Es0,Scs0,Ccs0,As0},St) ->
+    Es1 = exprs(Es0,St),
+    Scs1 = icr_clauses(Scs0,St),
+    Ccs1 = icr_clauses(Ccs0,St),
+    As1 = exprs(As0,St),
+    {'try',Line,Es1,Scs1,Ccs1,As1};
+expr({'fun',_,{function,_,_,_}}=ExtFun,_St) ->
+    ExtFun;
+expr({'fun',Line,Body},St) ->
+    case Body of
+	{clauses,Cs0} ->
+	    Cs1 = fun_clauses(Cs0,St),
+	    {'fun',Line,{clauses,Cs1}};
+	{function,F,A} = Function ->
+	    {F1,A1} = update_function_name({F,A}),
+	    if A1 =:= A ->
+		    {'fun',Line,Function};
+	       true ->
+		    %% Must rewrite local fun-name to a fun that does a
+		    %% call with the extra THIS parameter.
+		    As = make_vars(A, Line),
+		    As1 = As ++ [{var,Line,'THIS'}],
+		    Call = {call,Line,{atom,Line,F1},As1},
+		    Cs = [{clause,Line,As,[],[Call]}],
+		    {'fun',Line,{clauses,Cs}}
+	    end;
+	{function,_M,_F,_A} = Fun4 ->		%This is an error in lint!
+	    {'fun',Line,Fun4}
+    end;
+expr({call,Lc,{atom,_,instance}=Name,As0},St) ->
+    %% All local functions 'instance(...)' are static by definition,
+    %% so they do not take a 'THIS' argument when called
+    As1 = expr_list(As0,St),
+    {call,Lc,Name,As1};
+expr({call,Lc,{atom,_,new}=Name,As0},St) ->
+    %% All local functions 'new(...)' are static by definition,
+    %% so they do not take a 'THIS' argument when called
+    As1 = expr_list(As0,St),
+    {call,Lc,Name,As1};
+expr({call,Lc,{atom,_Lf,F}=Atom,As0}, #pmod{defined=Def}=St) ->
+    As1 = expr_list(As0,St),
+    case gb_sets:is_member({F,length(As0)}, Def) of
+	false ->
+	    %% BIF or imported function.
+	    {call,Lc,Atom,As1};
+	true ->
+	    %% Local function call - needs THIS parameter.
+	    {call,Lc,Atom,As1 ++ [{var,0,'THIS'}]}
+    end;
+expr({call,Line,F0,As0},St) ->
+    %% Other function call
+    F1 = expr(F0,St),
+    As1 = expr_list(As0,St),
+    {call,Line,F1,As1};
+expr({'catch',Line,E0},St) ->
+    E1 = expr(E0,St),
+    {'catch',Line,E1};
+expr({match,Line,P,E0},St) ->
+    E1 = expr(E0,St),
+    {match,Line,P,E1};
+expr({bin,Line,Fs},St) ->
+    Fs2 = pattern_grp(Fs,St),
+    {bin,Line,Fs2};
+expr({op,Line,Op,A0},St) ->
+    A1 = expr(A0,St),
+    {op,Line,Op,A1};
+expr({op,Line,Op,L0,R0},St) ->
+    L1 = expr(L0,St),
+    R1 = expr(R0,St),
+    {op,Line,Op,L1,R1};
+%% The following are not allowed to occur anywhere!
+expr({remote,Line,M0,F0},St) ->
+    M1 = expr(M0,St),
+    F1 = expr(F0,St),
+    {remote,Line,M1,F1}.
+
+expr_list([E0|Es],St) ->
+    E1 = expr(E0,St),
+    [E1|expr_list(Es,St)];
+expr_list([],_St) -> [].
+
+record_fields([{record_field,L,K,E0}|T],St) ->
+    E = expr(E0,St),
+    [{record_field,L,K,E}|record_fields(T,St)];
+record_fields([],_) -> [].
+
+icr_clauses([C0|Cs],St) ->
+    C1 = clause(C0,St),
+    [C1|icr_clauses(Cs,St)];
+icr_clauses([],_St) -> [].
+
+lc_bc_quals([{generate,Line,P,E0}|Qs],St) ->
+    E1 = expr(E0,St),
+    [{generate,Line,P,E1}|lc_bc_quals(Qs,St)];
+lc_bc_quals([{b_generate,Line,P,E0}|Qs],St) ->
+    E1 = expr(E0,St),
+    [{b_generate,Line,P,E1}|lc_bc_quals(Qs,St)];
+lc_bc_quals([E0|Qs],St) ->
+    E1 = expr(E0,St),
+    [E1|lc_bc_quals(Qs,St)];
+lc_bc_quals([],_St) -> [].
+
+fun_clauses([C0|Cs],St) ->
+    C1 = clause(C0,St),
+    [C1|fun_clauses(Cs,St)];
+fun_clauses([],_St) -> [].
+
+make_vars(N, L) ->
+    make_vars(1, N, L).
+
+make_vars(N, M, L) when N =< M ->
+    V = list_to_atom("X"++integer_to_list(N)),
+    [{var,L,V} | make_vars(N + 1, M, L)];
+make_vars(_, _, _) ->
+    [].
diff --git a/src/sockjs_multiplex_channel.erl b/src/sockjs_multiplex_channel.erl
index cbb8274..5afcfa3 100644
--- a/src/sockjs_multiplex_channel.erl
+++ b/src/sockjs_multiplex_channel.erl
@@ -1,3 +1,5 @@
+-compile({parse_transform,pmod_pt}).
+
 -module(sockjs_multiplex_channel, [Conn, Topic]).
 
 -export([send/1, close/0, close/2, info/0]).
