diff --git a/core/effects/effects.factor b/core/effects/effects.factor
index 216f50dd8e..12573ad937 100644
--- a/core/effects/effects.factor
+++ b/core/effects/effects.factor
@@ -100,9 +100,6 @@ M: effect clone
 : stack-height ( word -- n )
     stack-effect effect-height ;
 
-: split-shuffle ( stack shuffle -- stack1 stack2 )
-    in>> length cut* ;
-
 : shuffle-mapping ( effect -- mapping )
     [ out>> ] [ in>> ] bi [ index ] curry map ;