diff --git a/ps-grammar/confirm/confirm.jsgf b/ps-grammar/confirm/confirm.jsgf
index 0993d81c207c7de231e569ec1a1ed68a27f7ce3c..246e8bf41fc6e13d20c3a0a92c7dd0961232c94e 100644
--- a/ps-grammar/confirm/confirm.jsgf
+++ b/ps-grammar/confirm/confirm.jsgf
@@ -1,5 +1,5 @@
 #JSGF V1.0;
 grammar ToBI_confirm;
-public <confirm> = [tobi] (<confirm_yes> | <confirm_no>) [tobi];
+public <confirm> = <confirm_yes> | <confirm_no>;
 <confirm_yes> = (tobi yes);
 <confirm_no> = (tobi no);