diff --git a/lib/Target/NVPTX/NVPTXLowerAlloca.cpp b/lib/Target/NVPTX/NVPTXLowerAlloca.cpp
index cf488b06f06..1bd02552b66 100644
--- a/lib/Target/NVPTX/NVPTXLowerAlloca.cpp
+++ b/lib/Target/NVPTX/NVPTXLowerAlloca.cpp
@@ -70,7 +70,7 @@ bool NVPTXLowerAlloca::runOnFunction(Function &F) {
     for (auto &I : BB) {
       if (auto allocaInst = dyn_cast<AllocaInst>(&I)) {
         Changed = true;
-        auto ETy = cast<PointerType>(allocaInst->getType())->getElementType();
+        auto ETy = allocaInst->getAllocatedType();
         auto LocalAddrTy = PointerType::get(ETy, ADDRESS_SPACE_LOCAL);
         auto NewASCToLocal = new AddrSpaceCastInst(allocaInst, LocalAddrTy, "");
         auto GenericAddrTy = PointerType::get(ETy, ADDRESS_SPACE_GENERIC);