diff --git a/TTS/vocoder/datasets/preprocess.py b/TTS/vocoder/datasets/preprocess.py
index 62bd4ba5..91dad459 100644
--- a/TTS/vocoder/datasets/preprocess.py
+++ b/TTS/vocoder/datasets/preprocess.py
@@ -30,7 +30,7 @@ def preprocess_wav_files(out_path: str, config: Coqpit, ap: AudioProcessor):
         np.save(mel_path, mel)
         if isinstance(config.mode, int):
             quant = (
-                ap.mulaw_encode(y, qc=config.mode) if config.model_params.mulaw else ap.quantize(y, bits=config.mode)
+                ap.mulaw_encode(y, qc=config.mode) if config.model_args.mulaw else ap.quantize(y, bits=config.mode)
             )
             np.save(quant_path, quant)