diff --git a/js/src/jsapi.h b/js/src/jsapi.h
index 93aaa4bd526..11e095bc160 100644
--- a/js/src/jsapi.h
+++ b/js/src/jsapi.h
@@ -326,12 +326,6 @@ JSID_TO_STRING(jsid id)
     return (JSString *)(JSID_BITS(id));
 }
 
-static JS_ALWAYS_INLINE JSBool
-JSID_IS_ZERO(jsid id)
-{
-    return JSID_BITS(id) == NULL;
-}
-
 JS_PUBLIC_API(JSBool)
 JS_StringHasBeenInterned(JSString *str);
 
diff --git a/js/src/jsscopeinlines.h b/js/src/jsscopeinlines.h
index cdd7b2c7778..11a9b3cc721 100644
--- a/js/src/jsscopeinlines.h
+++ b/js/src/jsscopeinlines.h
@@ -173,10 +173,6 @@ Shape::Shape(jsid id, js::PropertyOp getter, js::PropertyOp setter, uint32 slot,
     table(NULL), id(id), rawGetter(getter), rawSetter(setter), slot(slot), attrs(uint8(attrs)),
     flags(uint8(flags)), shortid(int16(shortid)), parent(NULL)
 {
-#define JS_CRASH(addr) *(int *) addr = 0
-    if (JSID_IS_ZERO(id))
-        JS_CRASH(0xa8);
-#undef JS_CRASH
     JS_ASSERT_IF(slotSpan != SHAPE_INVALID_SLOT, slotSpan < JSObject::NSLOTS_LIMIT);
     JS_ASSERT_IF(getter && (attrs & JSPROP_GETTER), getterObj->isCallable());
     JS_ASSERT_IF(setter && (attrs & JSPROP_SETTER), setterObj->isCallable());