diff --git a/lib/iscsi/iscsi.c b/lib/iscsi/iscsi.c
index 615977771..f54d01b1f 100644
--- a/lib/iscsi/iscsi.c
+++ b/lib/iscsi/iscsi.c
@@ -2484,8 +2484,11 @@ iscsi_pdu_hdr_op_logout(struct spdk_iscsi_conn *conn, struct spdk_iscsi_pdu *pdu
 		      reqh->reason, task_tag, cid);
 
 	if (conn->sess != NULL) {
-		if (reqh->reason != 0 && conn->sess->session_type == SESSION_TYPE_DISCOVERY) {
-			SPDK_ERRLOG("only logout with close the session reason can be in discovery session\n");
+		if (conn->sess->session_type == SESSION_TYPE_DISCOVERY &&
+		    reqh->reason != ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
+			SPDK_ERRLOG("Target can accept logout only with reason \"close the session\" "
+				    "on discovery session. %d is not acceptable reason.\n",
+				    reqh->reason);
 			return SPDK_ISCSI_CONNECTION_FATAL;
 		}
 
diff --git a/lib/iscsi/iscsi.h b/lib/iscsi/iscsi.h
index 863fa434e..3de512b7a 100644
--- a/lib/iscsi/iscsi.h
+++ b/lib/iscsi/iscsi.h
@@ -358,6 +358,11 @@ struct spdk_iscsi_globals {
 #define ISCSI_NSG_RESERVED_CODE			2
 #define ISCSI_FULL_FEATURE_PHASE		3
 
+/* logout reason */
+#define ISCSI_LOGOUT_REASON_CLOSE_SESSION		0
+#define ISCSI_LOGOUT_REASON_CLOSE_CONNECTION		1
+#define ISCSI_LOGOUT_REASON_REMOVE_CONN_FOR_RECOVERY	2
+
 enum spdk_error_codes {
 	SPDK_ISCSI_CONNECTION_FATAL	= -1,
 	SPDK_PDU_FATAL		= -2,