diff --git a/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp b/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
index bf769ec62c30b..913c7146b9540 100644
--- a/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
+++ b/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
@@ -431,7 +431,7 @@ static Function *doPromotion(
     }
 
     for (Instruction *I : DeadInsts) {
-      I->replaceAllUsesWith(UndefValue::get(I->getType()));
+      I->replaceAllUsesWith(PoisonValue::get(I->getType()));
       I->eraseFromParent();
     }
   }