diff --git a/api/audio/echo_control.h b/api/audio/echo_control.h
index 9872889204..d16c1ff086 100644
--- a/api/audio/echo_control.h
+++ b/api/audio/echo_control.h
@@ -39,11 +39,7 @@ class EchoControl {
   virtual Metrics GetMetrics() const = 0;
 
   // Provides an optional external estimate of the audio buffer delay.
-  virtual void SetAudioBufferDelay(size_t delay_ms) {}
-  virtual void SetAudioBufferDelay(int delay_ms) {
-    // Default to old implementation.
-    SetAudioBufferDelay(static_cast<size_t>(delay_ms));
-  }
+  virtual void SetAudioBufferDelay(int delay_ms) = 0;
 
   // Returns wheter the signal is altered.
   virtual bool ActiveProcessing() const = 0;