diff --git a/llvm/lib/CodeGen/LowLevelType.cpp b/llvm/lib/CodeGen/LowLevelType.cpp
--- a/llvm/lib/CodeGen/LowLevelType.cpp
+++ b/llvm/lib/CodeGen/LowLevelType.cpp
@@ -18,7 +18,7 @@
 using namespace llvm;
 
 LLT llvm::getLLTForType(Type &Ty, const DataLayout &DL) {
-  if (auto VTy = dyn_cast<VectorType>(&Ty)) {
+  if (auto VTy = dyn_cast<FixedVectorType>(&Ty)) {
     auto NumElements = VTy->getNumElements();
     LLT ScalarTy = getLLTForType(*VTy->getElementType(), DL);
     if (NumElements == 1)