diff --git a/lib/Analysis/AliasAnalysis.cpp b/lib/Analysis/AliasAnalysis.cpp
index 7f9c9c1..363da9f 100644
--- a/lib/Analysis/AliasAnalysis.cpp
+++ b/lib/Analysis/AliasAnalysis.cpp
@@ -179,7 +179,7 @@
 
   // Otherwise, fall back to the next AA in the chain. But we can merge
   // in any result we've managed to compute.
-  return std::min(AA->getModRefBehavior(CS), Min);
+  return ModRefBehavior(AA->getModRefBehavior(CS) & Min);
 }
 
 AliasAnalysis::ModRefBehavior