Index: apps/app_mixmonitor.c
===================================================================
--- apps/app_mixmonitor.c	(revision 38087)
+++ apps/app_mixmonitor.c	(working copy)
@@ -254,7 +254,7 @@
 	}
 
 	/* Pre-allocate mixmonitor structure and spy */
-	if (!(mixmonitor = calloc(1, len))) {
+	if (!(mixmonitor = calloc(1, len <= 64 ? 65 : len ))) {
 		return;
 	}