diff --git a/asyncua/sync.py b/asyncua/sync.py
index fe0b9fadf..0bcbfea4d 100644
--- a/asyncua/sync.py
+++ b/asyncua/sync.py
@@ -128,6 +128,10 @@ def set_password(self, pwd: str):
     def load_type_definitions(self, nodes=None):
         pass
 
+    @syncmethod
+    async def load_data_type_definitions(self, node=None):
+        pass
+
     @syncmethod
     def set_security(self):
         pass