diff --git a/list_subtitles.py b/list_subtitles.py
index e5c47aa03..a5cd58ada 100644
--- a/list_subtitles.py
+++ b/list_subtitles.py
@@ -36,7 +36,7 @@ def store_subtitles(file):
     languages = []
     actual_subtitles = []
     if os.path.exists(file):
-    	if os.path.splitext(file)[1] == '.mkv':
+        if os.path.splitext(file)[1] == '.mkv':
             try:
                 with open(file, 'rb') as f:
                     mkv = enzyme.MKV(f)