diff --git a/sherpa-onnx/csrc/voice-activity-detector.cc b/sherpa-onnx/csrc/voice-activity-detector.cc
index 8bc8f7c9..953355a9 100644
--- a/sherpa-onnx/csrc/voice-activity-detector.cc
+++ b/sherpa-onnx/csrc/voice-activity-detector.cc
@@ -126,6 +126,7 @@ class VoiceActivityDetector::Impl {
 
     model_->Reset();
     buffer_.Reset();
+    last_.clear();
 
     start_ = -1;
   }