diff --git a/preprocessor_config.json b/preprocessor_config.json
index 6e0c29c..d93e9e5 100644
--- a/preprocessor_config.json
+++ b/preprocessor_config.json
@@ -2,6 +2,7 @@
   "do_normalize": true,
   "feature_extractor_type": "ASTFeatureExtractor",
   "feature_size": 1,
+  "max_length": 1024,
   "mean": -4.2677393,
   "num_mel_bins": 128,
   "padding_side": "right",