diff --git a/lib/pdu.c b/lib/pdu.c
index 3c4bc3a..3866816 100644
--- a/lib/pdu.c
+++ b/lib/pdu.c
@@ -324,6 +324,7 @@ int iscsi_process_target_nop_in(struct iscsi_context *iscsi,
 	ttt = scsi_get_uint32(&in->hdr[20]);
 
 	iscsi_adjust_statsn(iscsi, in);
+	iscsi_adjust_maxexpcmdsn(iscsi, in);
 
 	/* if the server does not want a response */
 	if (ttt == 0xffffffff) {