diff --git a/lib/Analysis/LazyValueInfo.cpp b/lib/Analysis/LazyValueInfo.cpp
index 02d91807aea..d27d9116103 100644
--- a/lib/Analysis/LazyValueInfo.cpp
+++ b/lib/Analysis/LazyValueInfo.cpp
@@ -446,6 +446,7 @@ namespace {
     
     /// clear - Empty the cache.
     void clear() {
+      SeenBlocks.clear();
       ValueCache.clear();
       OverDefinedCache.clear();
     }