diff --git a/plugins/better-alias/balias.fish b/plugins/better-alias/balias.fish
index 1d14075..a80c725 100644
--- a/plugins/better-alias/balias.fish
+++ b/plugins/better-alias/balias.fish
@@ -1,11 +1,10 @@
 function balias --argument alias command
   eval 'alias $alias $command'
   if expr $command : '^sudo '>/dev/null
-    set command (expr substr + $command 6 (expr length $command))
+    set command (echo "$command" | cut -c6-)
   end
   complete -c $alias -xa "(
     set -l cmd (commandline -pc | sed -e 's/^ *\S\+ *//' );
     complete -C\"$command \$cmd\";
   )"
 end
-
diff --git a/plugins/better-alias/balias.spec.fish b/plugins/better-alias/balias.spec.fish
index c65380a..8b869a8 100644
--- a/plugins/better-alias/balias.spec.fish
+++ b/plugins/better-alias/balias.spec.fish
@@ -5,6 +5,7 @@ function describe_library -d "better-alias"
 
   function after_all
     functions -e changedir
+    functions -e ls_as_root
   end
 
   function it_doesnt_fail
@@ -25,6 +26,11 @@ function describe_library -d "better-alias"
     rmdir testdir
   end
 
+  function it_chops_off_sudo
+    balias ls_as_root 'sudo ls'
+    expect test $status --to-be-true
+  end
+
 end
 
 spec.run $argv
\ No newline at end of file