diff --git a/openbsc/src/libabis/input/ipaccess.c b/openbsc/src/libabis/input/ipaccess.c
index e1e314b..c4c13d7 100644
--- a/openbsc/src/libabis/input/ipaccess.c
+++ b/openbsc/src/libabis/input/ipaccess.c
@@ -100,7 +100,7 @@
 	[IPAC_IDTAG_UNIT]	= "Unit_ID",
 };
 
-const char *ipaccess_idtag_name(int tag)
+const char *ipaccess_idtag_name(uint8_t tag)
 {
 	if (tag >= ARRAY_SIZE(idtag_names))
 		return "unknown";