diff --git a/include/usage.h b/include/usage.h
index 7e23de92d..f5bd96a47 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -88,7 +88,7 @@
        "	-A		ARP answer mode, update your neighbours\n" \
        "	-c count	Stop after sending count ARP request packets\n" \
        "	-w timeout	Time to wait for ARP reply, in seconds\n" \
-       "	-i device	Outgoing interface name, default is eth0\n" \
+       "	-I device	Outgoing interface name, default is eth0\n" \
        "	-s sender	Set specific sender IP address\n" \
        "	target		Target IP address of ARP request"
 
diff --git a/networking/arping.c b/networking/arping.c
index d65be815a..1b2604902 100644
--- a/networking/arping.c
+++ b/networking/arping.c
@@ -259,7 +259,7 @@ int arping_main(int argc, char **argv)
 		 * Advert also sets unsolicited.
 		 */
 		opt_complementary = "Df:AU";
-		opt = getopt32(argc, argv, "DUAqfbc:w:i:s:",
+		opt = getopt32(argc, argv, "DUAqfbc:w:I:s:",
 					&_count, &_timeout, &device, &source);
 		cfg |= opt & 0x3f; /* set respective flags */
 		if (opt & 0x40) /* -c: count */