diff --git a/core/classes/mixin/mixin.factor b/core/classes/mixin/mixin.factor
index 2f9204a246..ec5c2ef2e4 100644
--- a/core/classes/mixin/mixin.factor
+++ b/core/classes/mixin/mixin.factor
@@ -18,8 +18,6 @@ M: mixin-class reset-class
 
 M: mixin-class rank-class drop 8 ;
 
-M: mixin-class definer drop \ MIXIN: f ;
-
 TUPLE: check-mixin-class class ;
 
 : check-mixin-class ( mixin -- mixin )