Index: mlir/include/mlir/IR/Attributes.h
===================================================================
--- mlir/include/mlir/IR/Attributes.h
+++ mlir/include/mlir/IR/Attributes.h
@@ -52,7 +52,7 @@
 /// with immutable, uniqued key owned by MLIRContext. As such, an Attribute is a
 /// thin wrapper around an underlying storage pointer. Attributes are usually
 /// passed by value.
-class Attribute {
+class alignas(8) Attribute {
 public:
   /// Utility class for implementing attributes.
   template <typename ConcreteType, typename BaseType, typename StorageType,