diff --git a/dlls/jscript/compile.c b/dlls/jscript/compile.c
index 8bb397d9e3f..6afef2c778f 100644
--- a/dlls/jscript/compile.c
+++ b/dlls/jscript/compile.c
@@ -1806,11 +1806,24 @@ static HRESULT compile_function(compiler_ctx_t *ctx, source_elements_t *source,
     }
 
     if(func_expr) {
+        parameter_t *param_iter;
+
         func->source = func_expr->src_str;
         func->source_len = func_expr->src_len;
-    }
 
-    func->expr = func_expr;
+        for(param_iter = func_expr->parameter_list; param_iter; param_iter = param_iter->next)
+            func->param_cnt++;
+
+        func->params = compiler_alloc(ctx->code, func->param_cnt * sizeof(*func->params));
+        if(!func->params)
+            return E_OUTOFMEMORY;
+
+        for(param_iter = func_expr->parameter_list, i=0; param_iter; param_iter = param_iter->next, i++) {
+            func->params[i] = compiler_alloc_bstr(ctx, param_iter->identifier);
+            if(!func->params[i])
+                return E_OUTOFMEMORY;
+        }
+    }
 
     func->funcs = compiler_alloc(ctx->code, func->func_cnt * sizeof(*func->funcs));
     if(!func->funcs)
diff --git a/dlls/jscript/engine.c b/dlls/jscript/engine.c
index 189e19ba068..35339c80317 100644
--- a/dlls/jscript/engine.c
+++ b/dlls/jscript/engine.c
@@ -804,16 +804,13 @@ static HRESULT interp_end_finally(exec_ctx_t *ctx)
 static HRESULT interp_func(exec_ctx_t *ctx)
 {
     unsigned func_idx = ctx->code->instrs[ctx->ip].arg1.uint;
-    function_expression_t *expr;
     jsdisp_t *dispex;
     VARIANT v;
     HRESULT hres;
 
     TRACE("%d\n", func_idx);
 
-    expr = ctx->func_code->funcs[func_idx].expr;
-
-    hres = create_source_function(ctx->script, ctx->code, expr->parameter_list, ctx->func_code->funcs+func_idx,
+    hres = create_source_function(ctx->script, ctx->code, ctx->func_code->funcs+func_idx,
             ctx->scope_chain, &dispex);
     if(FAILED(hres))
         return hres;
@@ -2619,16 +2616,13 @@ HRESULT exec_source(exec_ctx_t *ctx, bytecode_t *code, function_code_t *func, BO
     HRESULT hres = S_OK;
 
     for(i = 0; i < func->func_cnt; i++) {
-        function_expression_t *expr;
         jsdisp_t *func_obj;
         VARIANT var;
 
         if(!func->funcs[i].name)
             continue;
 
-        expr = func->funcs[i].expr;
-        hres = create_source_function(ctx->script, code, expr->parameter_list, func->funcs+i,
-                ctx->scope_chain, &func_obj);
+        hres = create_source_function(ctx->script, code, func->funcs+i, ctx->scope_chain, &func_obj);
         if(FAILED(hres))
             return hres;
 
diff --git a/dlls/jscript/engine.h b/dlls/jscript/engine.h
index cc58aa88754..c57b89ef858 100644
--- a/dlls/jscript/engine.h
+++ b/dlls/jscript/engine.h
@@ -170,8 +170,6 @@ typedef struct _function_code_t {
     BSTR name;
     unsigned instr_off;
 
-    function_expression_t *expr; /* FIXME */
-
     const WCHAR *source;
     unsigned source_len;
 
@@ -180,6 +178,9 @@ typedef struct _function_code_t {
 
     unsigned var_cnt;
     BSTR *variables;
+
+    unsigned param_cnt;
+    BSTR *params;
 } function_code_t;
 
 typedef struct _bytecode_t {
@@ -269,11 +270,7 @@ static inline void exec_addref(exec_ctx_t *ctx)
 void exec_release(exec_ctx_t*) DECLSPEC_HIDDEN;
 HRESULT create_exec_ctx(script_ctx_t*,IDispatch*,jsdisp_t*,scope_chain_t*,BOOL,exec_ctx_t**) DECLSPEC_HIDDEN;
 HRESULT exec_source(exec_ctx_t*,bytecode_t*,function_code_t*,BOOL,jsexcept_t*,VARIANT*) DECLSPEC_HIDDEN;
-
-typedef struct _parameter_t parameter_t;
-
-HRESULT create_source_function(script_ctx_t*,bytecode_t*,parameter_t*,function_code_t*,scope_chain_t*,
-        jsdisp_t**) DECLSPEC_HIDDEN;
+HRESULT create_source_function(script_ctx_t*,bytecode_t*,function_code_t*,scope_chain_t*,jsdisp_t**) DECLSPEC_HIDDEN;
 
 typedef enum {
     LT_INT,
@@ -501,11 +498,10 @@ struct _expression_t {
     expression_type_t type;
 };
 
-struct _parameter_t {
+typedef struct _parameter_t {
     const WCHAR *identifier;
-
     struct _parameter_t *next;
-};
+} parameter_t;
 
 struct _source_elements_t {
     statement_t *statement;
diff --git a/dlls/jscript/function.c b/dlls/jscript/function.c
index 0377138e54b..31d3be3caad 100644
--- a/dlls/jscript/function.c
+++ b/dlls/jscript/function.c
@@ -28,7 +28,6 @@ typedef struct {
     builtin_invoke_t value_proc;
     const WCHAR *name;
     DWORD flags;
-    parameter_t *parameters;
     scope_chain_t *scope_chain;
     bytecode_t *code;
     function_code_t *func_code;
@@ -75,7 +74,6 @@ static IDispatch *get_this(DISPPARAMS *dp)
 static HRESULT init_parameters(jsdisp_t *var_disp, FunctionInstance *function, DISPPARAMS *dp,
         jsexcept_t *ei)
 {
-    parameter_t *param;
     VARIANT var_empty;
     DWORD cargs, i=0;
     HRESULT hres;
@@ -83,13 +81,11 @@ static HRESULT init_parameters(jsdisp_t *var_disp, FunctionInstance *function, D
     V_VT(&var_empty) = VT_EMPTY;
     cargs = arg_cnt(dp);
 
-    for(param = function->parameters; param; param = param->next) {
-        hres = jsdisp_propput_name(var_disp, param->identifier,
+    for(i=0; i < function->func_code->param_cnt; i++) {
+        hres = jsdisp_propput_name(var_disp, function->func_code->params[i],
                 i < cargs ? get_arg(dp,i) : &var_empty, ei);
         if(FAILED(hres))
             return hres;
-
-        i++;
     }
 
     return S_OK;
@@ -658,13 +654,11 @@ HRESULT create_builtin_function(script_ctx_t *ctx, builtin_invoke_t value_proc,
     return S_OK;
 }
 
-HRESULT create_source_function(script_ctx_t *ctx, bytecode_t *code, parameter_t *parameters, function_code_t *func_code,
+HRESULT create_source_function(script_ctx_t *ctx, bytecode_t *code, function_code_t *func_code,
         scope_chain_t *scope_chain, jsdisp_t **ret)
 {
     FunctionInstance *function;
     jsdisp_t *prototype;
-    parameter_t *iter;
-    DWORD length = 0;
     HRESULT hres;
 
     hres = create_object(ctx, NULL, &prototype);
@@ -681,9 +675,6 @@ HRESULT create_source_function(script_ctx_t *ctx, bytecode_t *code, parameter_t
     if(FAILED(hres))
         return hres;
 
-    function->func_code = func_code;
-    function->parameters = parameters;
-
     if(scope_chain) {
         scope_addref(scope_chain);
         function->scope_chain = scope_chain;
@@ -691,10 +682,8 @@ HRESULT create_source_function(script_ctx_t *ctx, bytecode_t *code, parameter_t
 
     bytecode_addref(code);
     function->code = code;
-
-    for(iter = parameters; iter; iter = iter->next)
-        length++;
-    function->length = length;
+    function->func_code = func_code;
+    function->length = function->func_code->param_cnt;
 
     *ret = &function->dispex;
     return S_OK;
@@ -702,7 +691,6 @@ HRESULT create_source_function(script_ctx_t *ctx, bytecode_t *code, parameter_t
 
 static HRESULT construct_function(script_ctx_t *ctx, DISPPARAMS *dp, jsexcept_t *ei, IDispatch **ret)
 {
-    function_expression_t *expr;
     WCHAR *str = NULL, *ptr;
     DWORD argc, len = 0, l;
     bytecode_t *code;
@@ -779,9 +767,8 @@ static HRESULT construct_function(script_ctx_t *ctx, DISPPARAMS *dp, jsexcept_t
         release_bytecode(code);
         return E_UNEXPECTED;
     }
-    expr = code->global_code.funcs[0].expr;
 
-    hres = create_source_function(ctx, code, expr->parameter_list, code->global_code.funcs, NULL, &function);
+    hres = create_source_function(ctx, code, code->global_code.funcs, NULL, &function);
     release_bytecode(code);
     if(FAILED(hres))
         return hres;
diff --git a/dlls/jscript/jscript.c b/dlls/jscript/jscript.c
index da34c1155b4..bf6710b2736 100644
--- a/dlls/jscript/jscript.c
+++ b/dlls/jscript/jscript.c
@@ -836,7 +836,7 @@ static HRESULT WINAPI JScriptParseProcedure_ParseProcedureText(IActiveScriptPars
         return hres;
     }
 
-    hres = create_source_function(This->ctx, code, NULL, &code->global_code, NULL,  &dispex);
+    hres = create_source_function(This->ctx, code, &code->global_code, NULL,  &dispex);
     release_bytecode(code);
     if(FAILED(hres))
         return hres;