diff --git a/lib/Transforms/Vectorize/LoopVectorize.cpp b/lib/Transforms/Vectorize/LoopVectorize.cpp
index ac62b110adb..20e073b1b94 100644
--- a/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -82,7 +82,7 @@ VectorizationFactor("force-vector-width", cl::init(0), cl::Hidden,
           cl::desc("Set the default vectorization width. Zero is autoselect."));
 
 static cl::opt<bool>
-EnableIfConversion("enable-if-conversion", cl::init(false), cl::Hidden,
+EnableIfConversion("enable-if-conversion", cl::init(true), cl::Hidden,
                    cl::desc("Enable if-conversion during vectorization."));
 
 /// We don't vectorize loops with a known constant trip count below this number.