diff --git a/core/definitions/definitions.factor b/core/definitions/definitions.factor
index c95c5816ac..636067e04b 100644
--- a/core/definitions/definitions.factor
+++ b/core/definitions/definitions.factor
@@ -3,8 +3,6 @@
 USING: kernel sequences namespaces assocs graphs math math.order ;
 IN: definitions
 
-MIXIN: definition
-
 ERROR: no-compilation-unit definition ;
 
 SYMBOLS: inlined-dependency flushed-dependency called-dependency ;
@@ -42,7 +40,7 @@ GENERIC: set-where ( loc defspec -- )
 
 GENERIC: forget* ( defspec -- )
 
-M: object forget* drop ;
+M: f forget* drop ;
 
 SYMBOL: forgotten-definitions
 
@@ -53,8 +51,6 @@ SYMBOL: forgotten-definitions
 
 : forget-all ( definitions -- ) [ forget ] each ;
 
-GENERIC: synopsis* ( defspec -- )
-
 GENERIC: definer ( defspec -- start end )
 
 GENERIC: definition ( defspec -- seq )