diff --git a/epan/dissectors/packet-nbns.c b/epan/dissectors/packet-nbns.c
index bb4ee1e556..b9894fb136 100644
--- a/epan/dissectors/packet-nbns.c
+++ b/epan/dissectors/packet-nbns.c
@@ -1717,6 +1717,8 @@ dissect_nbss(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
             && tvb_get_guint8(tvb,offset+6) == 'M'
             && tvb_get_guint8(tvb,offset+7) == 'B') {
             is_cifs = TRUE;
+        } else {
+            is_cifs = FALSE;
         }
 
         /*