diff -r f112c18bc304 -r 633956ca9421 lemon/maps.h
--- a/lemon/maps.h	Thu Mar 17 00:35:33 2011 +0100
+++ b/lemon/maps.h	Sun Apr 24 21:59:31 2011 +0200
@@ -3252,7 +3252,7 @@
 
     virtual void add(const Key& key) {
       Parent::add(key);
-      unlace(key);
+      lace(key);
     }
 
     virtual void add(const std::vector<Key>& keys) {