diff --git a/conv1to2 b/conv1to2
index 10658ee..defaf0a 100755
--- a/conv1to2
+++ b/conv1to2
@@ -12,5 +12,5 @@ done
 echo 'sure?'
 read i
 for file in $( ls | grep "$1" )
-do mv -iv "$file" "$( echo $file | sed s/"$1"/"$2"/g )"
+do mv -iv -- "$file" "$( echo $file | sed s/"$1"/"$2"/g )"
 done