diff --git a/contrib/completion/mas-completion.bash b/contrib/completion/mas-completion.bash
index d431b29..31d9a09 100644
--- a/contrib/completion/mas-completion.bash
+++ b/contrib/completion/mas-completion.bash
@@ -9,7 +9,7 @@ _mas() {
     _get_comp_words_by_ref cur prev words cword
   fi
   if [[ $cword -eq 1 ]]; then
-    COMPREPLY=($(compgen -W "$(mas help | tail +3 | awk '{print $1}')" -- "$cur"))
+    COMPREPLY=($(compgen -W "$(mas help | tail -n +3 | awk '{print $1}')" -- "$cur"))
     return 0
   fi
 }