diff --git a/modules/audio_processing/include/audio_processing.h b/modules/audio_processing/include/audio_processing.h
index 9d6824c038..1088f9b46d 100644
--- a/modules/audio_processing/include/audio_processing.h
+++ b/modules/audio_processing/include/audio_processing.h
@@ -369,12 +369,6 @@ class RTC_EXPORT AudioProcessing : public rtc::RefCountInterface {
       } adaptive_digital;
     } gain_controller2;
 
-    // TODO(bugs.webrtc.org/11539): Deprecated. Delete this flag. Replaced by
-    // injectable submodule.
-    struct ResidualEchoDetector {
-      bool enabled = false;
-    } residual_echo_detector;
-
     std::string ToString() const;
   };