diff --git a/rename_episode.sh b/rename_episode.sh
index 463539d..84c782c 100644
--- a/rename_episode.sh
+++ b/rename_episode.sh
@@ -21,7 +21,7 @@ for file in "$src"/*; do
     s=$so
   fi
   e=`echo "$file" | grep -o -P "$escheme"`
-  if [[ -z $eo ]];then
+  if [[ ! -z $eo ]];then
     e=$(e+eo)
   fi
   ext="${file##*.}"