new file mode 100644
--- /dev/null
+++ b/js/src/jit-test/tests/basic/testInitPropWithIntName.js
@@ -0,0 +1,2 @@
+for (var j=0; j<HOTLOOP; ++j)
+    ({'0': 0});

--- a/js/src/jstracer.cpp
+++ b/js/src/jstracer.cpp
@@ -12453,17 +12453,17 @@ TraceRecorder::recordInitPropertyOp(jsby
     JSObject* obj = &l.toObject();
     LIns* obj_ins = get(&l);
     JS_ASSERT(obj->getClass() == &js_ObjectClass);
 
     Value& v = stackval(-1);
     LIns* v_ins = get(&v);
 
     JSAtom* atom = atoms[GET_INDEX(cx->regs->pc)];
-    jsid id = ATOM_TO_JSID(atom);
+    jsid id = js_CheckForStringIndex(ATOM_TO_JSID(atom));
 
     // If obj already has this property (because JSOP_NEWOBJECT already set its
     // shape or because the id appears more than once in the initializer), just
     // set it. The existing property can't be an accessor property: we wouldn't
     // get here, as JSOP_SETTER can't be recorded.
     if (const Shape* shape = obj->nativeLookup(id)) {
         // Don't assign a bare (non-cloned) function to an ordinary or method
         // property. The opposite case, assigning some other value to a method,