diff --git a/mlir/lib/IR/BuiltinTypes.cpp b/mlir/lib/IR/BuiltinTypes.cpp
--- a/mlir/lib/IR/BuiltinTypes.cpp
+++ b/mlir/lib/IR/BuiltinTypes.cpp
@@ -515,6 +515,8 @@
     function_ref<void(Attribute)> walkAttrsFn,
     function_ref<void(Type)> walkTypesFn) const {
   walkTypesFn(getElementType());
+  if (getEncoding())
+    walkAttrsFn(getEncoding());
 }
 
 //===----------------------------------------------------------------------===//