diff --git a/lib/Analysis/IntervalPartition.cpp b/lib/Analysis/IntervalPartition.cpp
index 2d5f1cd..7280f8f 100644
--- a/lib/Analysis/IntervalPartition.cpp
+++ b/lib/Analysis/IntervalPartition.cpp
@@ -28,6 +28,7 @@
   for (unsigned i = 0, e = Intervals.size(); i != e; ++i)
     delete Intervals[i];
   IntervalMap.clear();
+  Intervals.clear();
   RootInterval = 0;
 }