diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
index 5ac2076..2ad37c0 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
@@ -265,8 +265,8 @@
 
 Instruction *InstCombiner::SimplifyMemSet(MemSetInst *MI) {
   unsigned Alignment = getKnownAlignment(MI->getDest(), DL, MI, &AC, &DT);
-  if (MI->getAlignment() < Alignment) {
-    MI->setAlignment(Alignment);
+  if (MI->getDestAlignment() < Alignment) {
+    MI->setDestAlignment(Alignment);
     return MI;
   }