diff --git a/llvm/include/llvm/ADT/IntervalMap.h b/llvm/include/llvm/ADT/IntervalMap.h
--- a/llvm/include/llvm/ADT/IntervalMap.h
+++ b/llvm/include/llvm/ADT/IntervalMap.h
@@ -963,8 +963,7 @@
 
 private:
   // The root data is either a RootLeaf or a RootBranchData instance.
-  alignas(RootLeaf) alignas(RootBranchData)
-      AlignedCharArrayUnion<RootLeaf, RootBranchData> data;
+  AlignedCharArrayUnion<RootLeaf, RootBranchData> data;
 
   // Tree height.
   // 0: Leaves in root.