diff --git a/llvm/lib/CodeGen/ScheduleDAG.cpp b/llvm/lib/CodeGen/ScheduleDAG.cpp
--- a/llvm/lib/CodeGen/ScheduleDAG.cpp
+++ b/llvm/lib/CodeGen/ScheduleDAG.cpp
@@ -201,7 +201,7 @@
   }
   if (!isScheduled) {
     if (D.isWeak()) {
-      assert(WeakSuccsLeft > 0 && "WeakSuccsLeft will underflow!");
+      assert(N->WeakSuccsLeft > 0 && "WeakSuccsLeft will underflow!");
       --N->WeakSuccsLeft;
     } else {
       assert(N->NumSuccsLeft > 0 && "NumSuccsLeft will underflow!");