diff --git a/completion/bash/task.bash b/completion/bash/task.bash
index 4ad88373..2633eac8 100644
--- a/completion/bash/task.bash
+++ b/completion/bash/task.bash
@@ -15,7 +15,7 @@ _task_completion()
     return
   fi
 
-  COMPREPLY=($(compgen -c | echo "$scripts" | grep $curr_arg));
+  COMPREPLY=($(compgen -c | echo "$scripts" | grep -- $curr_arg));
 }
 
 complete -F _task_completion task