diff --git a/training/deepspeech_training/util/audio.py b/training/deepspeech_training/util/audio.py
index 5e2ed5d9..05ceba38 100644
--- a/training/deepspeech_training/util/audio.py
+++ b/training/deepspeech_training/util/audio.py
@@ -171,6 +171,7 @@ class AudioFile:
         self.open_file = None
         self.open_wav = None
         self.tmp_file_path = None
+        self.tmp_src_file_path = None
 
     def __enter__(self):
         if self.audio_path.endswith('.wav'):