diff --git a/clang/lib/CodeGen/CGExprConstant.cpp b/clang/lib/CodeGen/CGExprConstant.cpp
index bddecff..e94fc67 100644
--- a/clang/lib/CodeGen/CGExprConstant.cpp
+++ b/clang/lib/CodeGen/CGExprConstant.cpp
@@ -356,7 +356,7 @@
     return true;
   }
 
-  if (auto *CAZ = dyn_cast<llvm::ConstantAggregateZero>(C)) {
+  if (isa<llvm::ConstantAggregateZero>(C)) {
     CharUnits ElemSize = getSize(C);
     assert(Hint > Offset && Hint < Offset + ElemSize && "nothing to split");
     replace(Elems, Index, Index + 1,