diff --git a/js/src/xpconnect/src/xpcprivate.h b/js/src/xpconnect/src/xpcprivate.h
index 1f877dd5d812..0d082a30716d 100644
--- a/js/src/xpconnect/src/xpcprivate.h
+++ b/js/src/xpconnect/src/xpcprivate.h
@@ -1391,14 +1391,7 @@ public:
          *pval = mVal; return JS_TRUE;}
 
     JSBool NewFunctionObject(XPCCallContext& ccx, XPCNativeInterface* iface,
-                             JSObject *parent, jsval* pval)
-        {NS_ASSERTION(!IsConstant(),
-                      "Only call this if you're sure this is not a constant!");
-         if(!IsResolved() && !Resolve(ccx, iface)) return JS_FALSE;
-         JSObject* funobj =
-            xpc_CloneJSFunction(ccx, JSVAL_TO_OBJECT(mVal), parent);
-         if(!funobj) return JS_FALSE;
-         *pval = OBJECT_TO_JSVAL(funobj); return JS_TRUE;}
+                             JSObject *parent, jsval* pval);
 
     JSBool IsMethod() const
         {return 0 != (mFlags & METHOD);}
diff --git a/js/src/xpconnect/src/xpcwrappednativeinfo.cpp b/js/src/xpconnect/src/xpcwrappednativeinfo.cpp
index 57da14424019..cde7d7c4dbfb 100644
--- a/js/src/xpconnect/src/xpcwrappednativeinfo.cpp
+++ b/js/src/xpconnect/src/xpcwrappednativeinfo.cpp
@@ -109,6 +109,27 @@ XPCNativeMember::GetCallInfo(XPCCallContext& ccx,
     return JS_TRUE;
 }
 
+JSBool
+XPCNativeMember::NewFunctionObject(XPCCallContext& ccx,
+                                   XPCNativeInterface* iface, JSObject *parent,
+                                   jsval* pval)
+{
+    NS_ASSERTION(!IsConstant(),
+                 "Only call this if you're sure this is not a constant!");
+    if(!IsResolved() && !Resolve(ccx, iface))
+        return JS_FALSE;
+
+    AUTO_MARK_JSVAL(ccx, &mVal);
+    JSObject* funobj =
+        xpc_CloneJSFunction(ccx, JSVAL_TO_OBJECT(mVal), parent);
+    if(!funobj)
+        return JS_FALSE;
+
+    *pval = OBJECT_TO_JSVAL(funobj);
+
+    return JS_TRUE;
+}
+
 JSBool
 XPCNativeMember::Resolve(XPCCallContext& ccx, XPCNativeInterface* iface)
 {