diff --git a/api/audio/audio_frame.cc b/api/audio/audio_frame.cc
index 3dc510dd3c..108a523d0b 100644
--- a/api/audio/audio_frame.cc
+++ b/api/audio/audio_frame.cc
@@ -8,6 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+#include <string.h>
+
 #include "api/audio/audio_frame.h"
 
 #include "rtc_base/checks.h"