diff --git a/src/gsm/gsm48.c b/src/gsm/gsm48.c
index 8a46f76..d0e050b 100644
--- a/src/gsm/gsm48.c
+++ b/src/gsm/gsm48.c
@@ -458,11 +458,10 @@
 	case GSM_MI_TYPE_NONE:
 		break;
 	case GSM_MI_TYPE_TMSI:
-		/* Table 10.5.4.3, reverse generate_mid_from_tmsi */
 		if (mi_len == GSM48_TMSI_LEN && mi[0] == (0xf0 | GSM_MI_TYPE_TMSI)) {
 			memcpy(&tmsi, &mi[1], 4);
 			tmsi = ntohl(tmsi);
-			return snprintf(string, str_len, "%u", tmsi);
+			return snprintf(string, str_len, "0x%08X", tmsi);
 		}
 		break;
 	case GSM_MI_TYPE_IMSI: