diff --git a/paddle/pybind/print_operators_doc.cc b/paddle/pybind/print_operators_doc.cc
index 99694fa592059d979297b72748125d02b2dd70a3..b55ddee17616ced4de659be8e55acd5e072c66b7 100644
--- a/paddle/pybind/print_operators_doc.cc
+++ b/paddle/pybind/print_operators_doc.cc
@@ -64,6 +64,8 @@ std::string AttrType(paddle::framework::proto::AttrType at) {
       return "bool array";
     case paddle::framework::proto::BLOCK:
       return "block id";
+    case paddle::framework::proto::LONG:
+      return "long";
   }
   return "UNKNOWN";  // not possible
 }