diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index 501f6afd60607..494db0493daca 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -999,7 +999,7 @@ static void reorderScalars(SmallVectorImpl<Value *> &Scalars,
                            ArrayRef<int> Mask) {
   assert(!Mask.empty() && "Expected non-empty mask.");
   SmallVector<Value *> Prev(Scalars.size(),
-                            UndefValue::get(Scalars.front()->getType()));
+                            PoisonValue::get(Scalars.front()->getType()));
   Prev.swap(Scalars);
   for (unsigned I = 0, E = Prev.size(); I < E; ++I)
     if (Mask[I] != PoisonMaskElem)