diff -urN bwping-1.2.orig/bwping.c bwping-1.2/bwping.c
--- bwping-1.2.orig/bwping.c	2010-01-22 17:49:29.000000000 +0000
+++ bwping-1.2/bwping.c	2010-12-07 12:30:26.000000000 +0000
@@ -221,7 +221,7 @@
     unsigned int		bufsize, tos, transmitted_number, received_number;
     unsigned long int		kbps, pktsize, volume, rperiod, received_volume;
     unsigned long long int	min_interval, interval, current_interval, integral_error;
-    char			ch;
+    int				ch;
     char			*ep, *target;
     fd_set			fds;
     struct sockaddr_in		to;