diff --git a/lib/Transforms/Scalar/CondPropagate.cpp b/lib/Transforms/Scalar/CondPropagate.cpp
index 4c3a9754963..fdcb404e11a 100644
--- a/lib/Transforms/Scalar/CondPropagate.cpp
+++ b/lib/Transforms/Scalar/CondPropagate.cpp
@@ -139,7 +139,7 @@ void CondProp::SimplifyPredecessors(BranchInst *BI) {
       // ultimate destination.
       bool PHIGone = PN->getNumIncomingValues() == 2;
       RevectorBlockTo(PN->getIncomingBlock(i-1),
-                      BI->getSuccessor(CB->getZExtValue() == 0));
+                      BI->getSuccessor(CB->isNullValue()));
       ++NumBrThread;
 
       // If there were two predecessors before this simplification, the PHI node