--- libev/ev_select.c	2007/11/04 15:58:50	1.12
+++ libev/ev_select.c	2007/11/04 23:14:11	1.13
@@ -48,6 +48,9 @@
   int offs = fd >> 3;
   int mask = 1 << (fd & 7);
 
+  if (oev == nev)
+    return;
+
   if (vec_max < (fd >> 5) + 1)
     {
       int new_max = (fd >> 5) + 1;