--- libev/ev.c	2008/05/22 03:42:34	1.251
+++ libev/ev.c	2008/05/22 03:43:32	1.252
@@ -1570,6 +1570,7 @@
     {
       assert (pendingmax [i] >= pendingcnt [i]);
 #if EV_IDLE_ENABLE
+      assert (idleall >= 0);
       assert (idlemax [i] >= idlecnt [i]);
       array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
 #endif