diff -r b873350e6258 -r 8d281761dea4 lemon/lp_base.h
--- a/lemon/lp_base.h	Thu Jan 19 15:25:06 2012 +0100
+++ b/lemon/lp_base.h	Sat May 05 10:22:44 2012 +0200
@@ -1542,7 +1542,7 @@
     void min() { _setSense(MIN); }
 
     ///Clears the problem
-    void clear() { _clear(); }
+    void clear() { _clear(); rows.clear(); cols.clear(); }
 
     /// Sets the message level of the solver
     void messageLevel(MessageLevel level) { _messageLevel(level); }