diff --git a/test/encode_test_driver.cc b/test/encode_test_driver.cc
index e93bc0938..43e99187d 100644
--- a/test/encode_test_driver.cc
+++ b/test/encode_test_driver.cc
@@ -126,6 +126,9 @@ void EncoderTest::RunLoop(VideoSource *video) {
 #if CONFIG_VP8_DECODER
   vpx_codec_dec_cfg_t dec_cfg = {0};
 #endif
+
+  stats_.Reset();
+
   for (unsigned int pass = 0; pass < passes_; pass++) {
     last_pts_ = 0;
 
diff --git a/test/encode_test_driver.h b/test/encode_test_driver.h
index 3d74b7488..f06549268 100644
--- a/test/encode_test_driver.h
+++ b/test/encode_test_driver.h
@@ -65,6 +65,10 @@ class TwopassStatsStore {
     return buf;
   }
 
+  void Reset() {
+    buffer_.clear();
+  }
+
  protected:
   std::string  buffer_;
 };