diff --git a/basis/compiler/tree/identities/identities.factor b/basis/compiler/tree/identities/identities.factor
index 00632ec6f6..279875dd1c 100644
--- a/basis/compiler/tree/identities/identities.factor
+++ b/basis/compiler/tree/identities/identities.factor
@@ -8,7 +8,7 @@ compiler.tree.propagation.info ;
 IN: compiler.tree.identities
 
 : define-identities ( word identities -- )
-    [ integer-derived-ops ] dip
+    [ integer-derived-ops dup empty? f assert= ] dip
     '[ _ "identities" set-word-prop ] each ;
 
 SYMBOL: X
@@ -29,18 +29,10 @@ SYMBOL: X
     { { 0 X } drop }
 } define-identities
 
-\ / {
-    { { X 1 } drop }
-} define-identities
-
 \ mod {
     { { X 1 } 0 }
 } define-identities
 
-\ rem {
-    { { X 1 } 0 }
-} define-identities
-
 \ bitand {
     { { X -1 } drop }
     { { -1 X } nip }