Index: iwcontrol.cc
===================================================================
--- iwcontrol.cc	(revision 1888)
+++ iwcontrol.cc	(working copy)
@@ -519,6 +519,7 @@
     memset(&wrq, 0, sizeof(struct iwreq));
 
     strncpy(wrq.ifr_name, in_dev, IFNAMSIZ);
+    wrq.u.freq.flags = IW_FREQ_FIXED; 
     IwFloat2Freq(in_ch, &wrq.u.freq);
 
     // Try twice with a tiny delay, some cards (madwifi) need a second chance...