diff --git a/lib/Transforms/Scalar/GVN.cpp b/lib/Transforms/Scalar/GVN.cpp
index bf2253fbd08..ec76892f879 100644
--- a/lib/Transforms/Scalar/GVN.cpp
+++ b/lib/Transforms/Scalar/GVN.cpp
@@ -1328,7 +1328,7 @@ bool GVN::iterateOnFunction(Function &F) {
        DE = df_end(DT.getRootNode()); DI != DE; ++DI)
     changed |= processBlock(*DI);
   
-  if (!EnablePRE)
+  if (EnablePRE)
     changed |= performPRE(F);
   
   return changed;