diff --git a/dom/tools/JSStubGen.cpp b/dom/tools/JSStubGen.cpp
index 3b3a58b99980..555ed006fddb 100644
--- a/dom/tools/JSStubGen.cpp
+++ b/dom/tools/JSStubGen.cpp
@@ -1336,7 +1336,7 @@ static const char *kInitClassBeginStr =
 "\n\n//\n"
 "// %s class initialization\n"
 "//\n"
-"nsresult NS_Init%sClass(nsIScriptContext *aContext, void **aPrototype)\n"
+"extern \"C\" NS_DOM nsresult NS_Init%sClass(nsIScriptContext *aContext, void **aPrototype)\n"
 "{\n"
 "  JSContext *jscontext = (JSContext *)aContext->GetNativeContext();\n"
 "  JSObject *proto = nsnull;\n"
diff --git a/dom/tools/XPCOMGen.cpp b/dom/tools/XPCOMGen.cpp
index c8e92888a51e..d59b65ee9e69 100644
--- a/dom/tools/XPCOMGen.cpp
+++ b/dom/tools/XPCOMGen.cpp
@@ -82,7 +82,7 @@ static const char *kFactoryClassDeclBeginStr =
 static const char *kConstructorDeclStr = "  NS_IMETHOD   CreateInstance(%snsIDOM%s **aReturn)=0;\n";
 static const char *kFactoryClassDeclEndStr = "\n};\n\n";
 static const char *kGlobalInitClassStr = "extern nsresult NS_Init%sClass(nsIScriptContext *aContext, nsIScriptGlobalObject *aGlobal);\n\n";
-static const char *kInitClassStr = "extern nsresult NS_Init%sClass(nsIScriptContext *aContext, void **aPrototype);\n\n";
+static const char *kInitClassStr = "extern \"C\" NS_DOM nsresult NS_Init%sClass(nsIScriptContext *aContext, void **aPrototype);\n\n";
 static const char *kNewObjStr = "extern \"C\" NS_DOM nsresult NS_NewScript%s(nsIScriptContext *aContext, nsISupports *aSupports, nsISupports *aParent, void **aReturn);\n\n";
 static const char *kMethodDeclMacroStr = "\n#define NS_DECL_IDOM%s   \\\n";
 static const char *kMethodForwardMacroStr = "\n#define NS_FORWARD_IDOM%s(_to)  \\\n";