diff --git a/share/functions/__fish_seen_argument.fish b/share/functions/__fish_seen_argument.fish
index 877554dfd..2f8704387 100644
--- a/share/functions/__fish_seen_argument.fish
+++ b/share/functions/__fish_seen_argument.fish
@@ -1,5 +1,5 @@
 function __fish_seen_argument
-    argparse 's/short=+' 'l/long=+' -- $argv
+    argparse 's/short=+' 'o/old=+' 'l/long=+' -- $argv
 
     set cmd (commandline -co)
     set -e cmd[1]
@@ -10,6 +10,12 @@ function __fish_seen_argument
             end
         end
 
+        for o in $_flag_o
+            if string match -qr "^-$s\$" -- $t
+                return 0
+            end
+        end
+
         for l in $_flag_l
             if string match -q -- "--$l" $t
                 return 0