diff --git a/llvm/lib/Transforms/IPO/AttributorAttributes.cpp b/llvm/lib/Transforms/IPO/AttributorAttributes.cpp
--- a/llvm/lib/Transforms/IPO/AttributorAttributes.cpp
+++ b/llvm/lib/Transforms/IPO/AttributorAttributes.cpp
@@ -5928,7 +5928,7 @@
         Size = AI.CB->getOperand(0);
       }
 
-      Align Alignment(1);
+      Align Alignment(16);
       if (AI.Kind == AllocationInfo::AllocationKind::ALIGNED_ALLOC) {
         Optional<APInt> AlignmentAPI =
             getAPInt(A, *this, *AI.CB->getArgOperand(0));