diff --git a/Source/JavaScriptCore/runtime/JSCell.cpp b/Source/JavaScriptCore/runtime/JSCell.cpp
index 9a93c59..f112cc4 100644
--- a/Source/JavaScriptCore/runtime/JSCell.cpp
+++ b/Source/JavaScriptCore/runtime/JSCell.cpp
@@ -117,10 +117,11 @@
     return JSValue();
 }
 
-JSValue JSCell::toPrimitive(ExecState*, PreferredPrimitiveType) const
+JSValue JSCell::toPrimitive(ExecState* exec, PreferredPrimitiveType preferredType) const
 {
-    ASSERT_NOT_REACHED();
-    return JSValue();
+    if (isString())
+        return static_cast<const JSString*>(this)->toPrimitive(exec, preferredType);
+    return static_cast<const JSObject*>(this)->toPrimitive(exec, preferredType);
 }
 
 bool JSCell::getPrimitiveNumber(ExecState*, double&, JSValue&)