diff --git a/sock.c b/sock.c
index 88a0df5..c948294 100644
--- a/sock.c
+++ b/sock.c
@@ -97,7 +97,7 @@
 	case SIOCSIFFLAGS:
 	case SIOCGIFFLAGS:
 		tprints("ifr_flags=");
-		printflags(iffflags, ifr->ifr_flags, "IFF_???");
+		printflags(iffflags, (unsigned short) ifr->ifr_flags, "IFF_???");
 		break;
 	case SIOCSIFMETRIC:
 	case SIOCGIFMETRIC: