diff --git a/src/gsm/auth_milenage.c b/src/gsm/auth_milenage.c
index e1a1dfb..2ddf712 100644
--- a/src/gsm/auth_milenage.c
+++ b/src/gsm/auth_milenage.c
@@ -112,7 +112,7 @@
 	 * { .ind_bitlen = 0, .ind = 0, .sqn = (desired_sqn - 1) }
 	 */
 
-	if (aud->u.umts.ind_bitlen > 28)
+	if (aud->u.umts.ind_bitlen > OSMO_MILENAGE_IND_BITLEN_MAX)
 		return -2;
 
 	seq_1 = 1LL << aud->u.umts.ind_bitlen;