diff --git a/modules/audio_processing/agc2/adaptive_digital_gain_controller_unittest.cc b/modules/audio_processing/agc2/adaptive_digital_gain_controller_unittest.cc
index 39e175d403..1647a5b6f9 100644
--- a/modules/audio_processing/agc2/adaptive_digital_gain_controller_unittest.cc
+++ b/modules/audio_processing/agc2/adaptive_digital_gain_controller_unittest.cc
@@ -11,6 +11,7 @@
 #include "modules/audio_processing/agc2/adaptive_digital_gain_controller.h"
 
 #include <algorithm>
+#include <cmath>
 #include <memory>
 
 #include "api/audio/audio_processing.h"