diff --git a/openbsc/tests/gtphub/gtphub_test.c b/openbsc/tests/gtphub/gtphub_test.c
index 12c9d78..2fa28c2 100644
--- a/openbsc/tests/gtphub/gtphub_test.c
+++ b/openbsc/tests/gtphub/gtphub_test.c
@@ -233,9 +233,9 @@
 	size_t len = sizeof(buf);
 	struct nr_mapping *m;
 	llist_for_each_entry(m, &map->mappings, entry) {
-		size_t wrote = snprintf(pos, len, "(%d->%d@%d), ",
-					(int)m->orig,
-					(int)m->repl,
+		size_t wrote = snprintf(pos, len, "(%u->%u@%d), ",
+					m->orig,
+					m->repl,
 					(int)m->expiry_entry.expiry);
 		OSMO_ASSERT(wrote < len);
 		pos += wrote;