diff --git a/xpfe/AppCores/src/nsJSBaseAppCore.cpp b/xpfe/AppCores/src/nsJSBaseAppCore.cpp
index c3b5e9b36f20..a7848de25f39 100644
--- a/xpfe/AppCores/src/nsJSBaseAppCore.cpp
+++ b/xpfe/AppCores/src/nsJSBaseAppCore.cpp
@@ -303,7 +303,7 @@ BaseAppCore(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
 //
 // BaseAppCore class initialization
 //
-nsresult NS_InitBaseAppCoreClass(nsIScriptContext *aContext, void **aPrototype)
+extern "C" NS_EXPORT nsresult NS_InitBaseAppCoreClass(nsIScriptContext *aContext, void **aPrototype)
 {
   JSContext *jscontext = (JSContext *)aContext->GetNativeContext();
   JSObject *proto = nsnull;