diff --git a/js/src/jstracer.cpp b/js/src/jstracer.cpp
index d08ba4f9698..9e0a2cd7d75 100644
--- a/js/src/jstracer.cpp
+++ b/js/src/jstracer.cpp
@@ -10210,11 +10210,6 @@ TraceRecorder::getThis(LIns*& this_ins)
         RETURN_ERROR("computeThis failed");
 
     /* thisv is a reference, so it'll see the newly computed |this|. */
-#ifdef DEBUG
-    JS_ASSERT(thisv.isObject());
-    JSObject *thisObj = &thisv.toObject();
-    JS_ASSERT(thisObj->getClass()->ext.innerObject);
-#endif
     this_ins = INS_CONSTOBJ(globalObj);
     set(&thisv, this_ins);
     return RECORD_CONTINUE;