--- a/ag.el	Tue May 08 02:00:23 2018 +0300
+++ b/ag.el	Sun May 13 00:29:14 2018 +0300
@@ -50,7 +50,7 @@
   :group 'my-ag)
 
 (defvar my-ag/keywords
-  '(("^[1-9][0-9]\\{0,5\\}:" . (0 'my-ag/lineno-face))
+  '(("^[1-9][0-9]\\{0,5\\}[-:]" . (0 'my-ag/lineno-face))
     ("^[^:]\\{6\\}.*" . (0 'my-ag/path-face))))
 
 (define-derived-mode my-ag-mode fundamental-mode "Ag"