diff --git a/lib/Support/Windows/Signals.inc b/lib/Support/Windows/Signals.inc
index 26c3c6e111a..6006499f4da 100644
--- a/lib/Support/Windows/Signals.inc
+++ b/lib/Support/Windows/Signals.inc
@@ -459,8 +459,8 @@ static void Cleanup() {
     }
 
   if (CallBacksToRun)
-    for (unsigned i = 0, e = CallBacksToRun->size(); i != e; ++i)
-      (*CallBacksToRun)[i].first((*CallBacksToRun)[i].second);
+    for (auto &I : *CallBacksToRun)
+      I.first(I.second);
 
   LeaveCriticalSection(&CriticalSection);
 }