diff --git a/lib/CodeGen/MachineScheduler.cpp b/lib/CodeGen/MachineScheduler.cpp
index 103b058..c872355 100644
--- a/lib/CodeGen/MachineScheduler.cpp
+++ b/lib/CodeGen/MachineScheduler.cpp
@@ -2182,7 +2182,7 @@
   /// Callback to select the highest priority node from the ready Q.
   virtual SUnit *pickNode(bool &IsTopNode) {
     if (ReadyQ.empty()) return NULL;
-    pop_heap(ReadyQ.begin(), ReadyQ.end(), Cmp);
+    std::pop_heap(ReadyQ.begin(), ReadyQ.end(), Cmp);
     SUnit *SU = ReadyQ.back();
     ReadyQ.pop_back();
     IsTopNode = false;