diff --git a/basis/ui/x11/x11.factor b/basis/ui/x11/x11.factor
index 34cff42777..d0d7eeb234 100755
--- a/basis/ui/x11/x11.factor
+++ b/basis/ui/x11/x11.factor
@@ -29,14 +29,14 @@ M: world configure-event
     ! In case dimensions didn't change
     relayout-1 ;
 
-: modifiers
+CONSTANT: modifiers
     {
         { S+ HEX: 1 }
         { C+ HEX: 4 }
         { A+ HEX: 8 }
-    } ;
-    
-: key-codes
+    }
+
+CONSTANT: key-codes
     H{
         { HEX: FF08 "BACKSPACE" }
         { HEX: FF09 "TAB"       }
@@ -62,7 +62,7 @@ M: world configure-event
         { HEX: FFC4 "F7"        }
         { HEX: FFC5 "F8"        }
         { HEX: FFC6 "F9"        }
-    } ;
+    }
 
 : key-code ( keysym -- keycode action? )
     dup key-codes at [ t ] [ 1string f ] ?if ;