diff --git a/clang/include/clang/Sema/ParsedAttr.h b/clang/include/clang/Sema/ParsedAttr.h
index 837725c079807..cb27dd727f0ff 100644
--- a/clang/include/clang/Sema/ParsedAttr.h
+++ b/clang/include/clang/Sema/ParsedAttr.h
@@ -702,7 +702,6 @@ class AttributePool {
 
   /// Move the given pool's allocations to this pool.
   AttributePool(AttributePool &&pool) = default;
-  AttributePool &operator=(AttributePool &&pool) = default;
 
   AttributeFactory &getFactory() const { return Factory; }