diff --git a/llvm/lib/Transforms/Utils/Debugify.cpp b/llvm/lib/Transforms/Utils/Debugify.cpp
index d6b1b1bf4b9f1..7448e3e80b465 100644
--- a/llvm/lib/Transforms/Utils/Debugify.cpp
+++ b/llvm/lib/Transforms/Utils/Debugify.cpp
@@ -266,7 +266,7 @@ bool llvm::stripDebugifyMetadata(Module &M) {
   SmallVector<MDNode *, 4> Flags(NMD->operands());
   NMD->clearOperands();
   for (MDNode *Flag : Flags) {
-    MDString *Key = dyn_cast_or_null<MDString>(Flag->getOperand(1));
+    auto *Key = cast<MDString>(Flag->getOperand(1));
     if (Key->getString() == "Debug Info Version") {
       Changed = true;
       continue;