diff --git a/src/gsm/auth_milenage.c b/src/gsm/auth_milenage.c
index f151c5e..c1331b5 100644
--- a/src/gsm/auth_milenage.c
+++ b/src/gsm/auth_milenage.c
@@ -94,7 +94,7 @@
 	ind_mask = ~(seq_1 - 1);
 
 	/* the ind index must not affect the SEQ part */
-	if (aud->u.umts.ind > seq_1)
+	if (aud->u.umts.ind >= seq_1)
 		return -3;
 
 	/* keep the incremented SQN local until gsm_milenage() succeeded. */