diff --git a/networking/udhcp/dhcpd.c b/networking/udhcp/dhcpd.c
index 9e726fbe5..2d1d5deba 100644
--- a/networking/udhcp/dhcpd.c
+++ b/networking/udhcp/dhcpd.c
@@ -303,7 +303,7 @@ int udhcpd_main(int argc UNUSED_PARAM, char **argv)
 		logmode |= LOGMODE_SYSLOG;
 	}
 #if ENABLE_FEATURE_UDHCP_PORT
-	if (opt & 4) { /* -P */
+	if (opt & 8) { /* -P */
 		SERVER_PORT = xatou16(str_P);
 		CLIENT_PORT = SERVER_PORT + 1;
 	}