diff --git a/src/pEpmodule.cc b/src/pEpmodule.cc
index 56ff5ee..6e4ab6b 100644
--- a/src/pEpmodule.cc
+++ b/src/pEpmodule.cc
@@ -310,7 +310,7 @@ BOOST_PYTHON_MODULE(pEp)
 
     auto sync_mixin_class = class_<SyncMixIn, SyncMixIn_callback, boost::noncopyable>(
             "SyncMixIn",
-    "class MySyncHandler(SyncMixIn)\n"
+    "class MySyncHandler(SyncMixIn):\n"
     "   def messageToSend(self, msg):\n"
     "       ...\n"
     "\n"