diff --git a/third_party/webrtc/modules/audio_processing/aec3/render_delay_controller.cc b/third_party/webrtc/modules/audio_processing/aec3/render_delay_controller.cc
index 826c38a1e..7fd2868c3 100644
--- a/third_party/webrtc/modules/audio_processing/aec3/render_delay_controller.cc
+++ b/third_party/webrtc/modules/audio_processing/aec3/render_delay_controller.cc
@@ -12,6 +12,7 @@
 #include <stddef.h>
 
 #include <algorithm>
+#include <atomic>
 #include <memory>
 
 #include "absl/types/optional.h"