diff --git a/pgxn/neon/control_plane_connector.c b/pgxn/neon/control_plane_connector.c
index 0730c305cb..4713103909 100644
--- a/pgxn/neon/control_plane_connector.c
+++ b/pgxn/neon/control_plane_connector.c
@@ -767,7 +767,7 @@ HandleDropRole(DropRoleStmt *stmt)
 		entry->type = Op_Delete;
 		entry->password = NULL;
 		if (!found)
-			memset(entry->old_name, 0, sizeof(entry));
+			memset(entry->old_name, 0, sizeof(entry->old_name));
 	}
 }