diff --git a/mlir/lib/Dialect/StandardOps/IR/Ops.cpp b/mlir/lib/Dialect/StandardOps/IR/Ops.cpp
--- a/mlir/lib/Dialect/StandardOps/IR/Ops.cpp
+++ b/mlir/lib/Dialect/StandardOps/IR/Ops.cpp
@@ -564,7 +564,8 @@
     return failure();
 
   Region *body = result.addRegion();
-  if (parser.parseRegion(*body, llvm::None, llvm::None))
+  if (parser.parseRegion(*body, llvm::None, llvm::None) ||
+      parser.parseOptionalAttrDict(result.attributes))
     return failure();
   result.types.push_back(memrefType.cast<MemRefType>().getElementType());
   return success();
diff --git a/mlir/test/IR/core-ops.mlir b/mlir/test/IR/core-ops.mlir
--- a/mlir/test/IR/core-ops.mlir
+++ b/mlir/test/IR/core-ops.mlir
@@ -839,7 +839,8 @@
       %c1 = constant 1.0 : f32
       %out = addf %c1, %old_value : f32
       atomic_yield %out : f32
-  }
+  // CHECK: index_attr = 8 : index
+  } { index_attr = 8 : index }
   return
 }