diff --git a/TTS/engine_wrapper.py b/TTS/engine_wrapper.py
index fd2d36b..017cf79 100644
--- a/TTS/engine_wrapper.py
+++ b/TTS/engine_wrapper.py
@@ -100,6 +100,7 @@ class TTSEngine:
         #     self.length += sox.file_info.duration(f"{self.path}/{filename}.mp3")
         clip = AudioFileClip(f"{self.path}/{filename}.mp3")
         self.length += clip.duration
+        clip.close()
 
 def process_text(text: str):
     lang = getenv("POSTLANG", "")