--- a/js/src/jsobj.cpp
+++ b/js/src/jsobj.cpp
@@ -1306,16 +1306,17 @@ obj_eval(JSContext *cx, JSObject *obj, u
             goto out;
 
         scopeobj = js_NewWithObject(cx, scopeobj,
                                     JS_GetGlobalForObject(cx, scopeobj), -1);
         if (!scopeobj) {
             ok = JS_FALSE;
             goto out;
         }
+        argv[1] = OBJECT_TO_JSVAL(scopeobj);
     }
 
     /* Ensure we compile this eval with the right object in the scope chain. */
     scopeobj = js_CheckScopeChainValidity(cx, scopeobj, js_eval_str);
     if (!scopeobj) {
         ok = JS_FALSE;
         goto out;
     }