diff --git a/api/mediastreaminterface.cc b/api/mediastreaminterface.cc
index 4821da83b3..0bc5d61e80 100644
--- a/api/mediastreaminterface.cc
+++ b/api/mediastreaminterface.cc
@@ -9,12 +9,21 @@
  */
 
 #include "api/mediastreaminterface.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/logging.h"
 
 namespace webrtc {
 
 const char MediaStreamTrackInterface::kVideoKind[] = "video";
 const char MediaStreamTrackInterface::kAudioKind[] = "audio";
 
+void AudioProcessorInterface::GetStats(AudioProcessorStats* /*stats*/) {
+  RTC_NOTREACHED() << "Old-style GetStats() is called but it has no "
+                   << "implementation.";
+  RTC_LOG(LS_ERROR) << "Old-style GetStats() is called but it has no "
+                    << "implementation.";
+}
+
 // TODO(ivoc): Remove this when the function becomes pure virtual.
 AudioProcessorInterface::AudioProcessorStatistics
 AudioProcessorInterface::GetStats(bool /*has_remote_tracks*/) {
diff --git a/api/mediastreaminterface.h b/api/mediastreaminterface.h
index 448cf9ad0c..1699e4cccb 100644
--- a/api/mediastreaminterface.h
+++ b/api/mediastreaminterface.h
@@ -258,7 +258,7 @@ class AudioProcessorInterface : public rtc::RefCountInterface {
   };
 
   // Get audio processor statistics.
-  virtual void GetStats(AudioProcessorStats* stats) = 0;
+  virtual void GetStats(AudioProcessorStats* stats);
 
   // Get audio processor statistics. The |has_remote_tracks| argument should be
   // set if there are active remote tracks (this would usually be true during