diff --git a/share/functions/__fish_toggle_comment_commandline.fish b/share/functions/__fish_toggle_comment_commandline.fish
index 33360bf05..35ba44797 100644
--- a/share/functions/__fish_toggle_comment_commandline.fish
+++ b/share/functions/__fish_toggle_comment_commandline.fish
@@ -9,7 +9,7 @@
 
 function __fish_toggle_comment_commandline --description 'Comment/uncomment the current command'
     set -l cmdlines (commandline -b)
-    if test "$cmdlines" = ""
+    if test -z "$cmdlines"
         set cmdlines (history search -p "#" --max=1)
     end
     set -l cmdlines (printf '%s\n' '#'$cmdlines | string replace -r '^##' '')