diff --git a/src/libosmo-mgcp/mgcp_trunk.c b/src/libosmo-mgcp/mgcp_trunk.c
index cc6637b..4f60cc9 100644
--- a/src/libosmo-mgcp/mgcp_trunk.c
+++ b/src/libosmo-mgcp/mgcp_trunk.c
@@ -147,7 +147,7 @@
 {
 	size_t prefix_len;
 	char epname_lc[MGCP_ENDPOINT_MAXLEN];
-	unsigned long int trunk_nr;
+	int trunk_nr;
 
 	osmo_str_tolower_buf(epname_lc, sizeof(epname_lc), epname);
 	epname = epname_lc;