diff --git a/yt_dlp/YoutubeDL.py b/yt_dlp/YoutubeDL.py
index 492017ba74..070f019b92 100644
--- a/yt_dlp/YoutubeDL.py
+++ b/yt_dlp/YoutubeDL.py
@@ -3467,7 +3467,7 @@ def run_pp(self, pp, infodict):
                 return infodict
             raise
 
-        if pp.PP_NAME = 'SubtitlesConvertor' and self.params.get('keepintermediate', False) == 'ConvertSubs':
+        if pp.PP_NAME == 'SubtitlesConvertor' and self.params.get('keepintermediate', False) == 'ConvertSubs':
             files_to_delete = []
 
         if not files_to_delete: