diff --git a/openbsc/src/gprs/gprs_gmm.c b/openbsc/src/gprs/gprs_gmm.c
index 36798e0..2f309a5 100644
--- a/openbsc/src/gprs/gprs_gmm.c
+++ b/openbsc/src/gprs/gprs_gmm.c
@@ -699,7 +699,8 @@
 			char mccmnc[16];
 			snprintf(mccmnc, sizeof(mccmnc), "%03d%02d", ra_id.mcc, ra_id.mnc);
 			if (strncmp(mccmnc, mi_string, 5) &&
-			    !sgsn_acl_lookup(mi_string)) {
+			    (sgsn->cfg.acl_enabled &&
+			     !sgsn_acl_lookup(mi_string))) {
 				LOGP(DMM, LOGL_INFO, "Rejecting ATTACH REQUESET IMSI=%s\n",
 				     mi_string);
 				return gsm48_tx_gmm_att_rej_oldmsg(msg,