diff --git a/webrtc/modules/audio_processing/aec/aec_core.c b/webrtc/modules/audio_processing/aec/aec_core.c
index d2d55ec93d..61f9e56532 100644
--- a/webrtc/modules/audio_processing/aec/aec_core.c
+++ b/webrtc/modules/audio_processing/aec/aec_core.c
@@ -1424,7 +1424,7 @@ static void ReopenWav(rtc_WavWriter** wav_file,
                       int seq1,
                       int seq2,
                       int sample_rate) {
-  int written UNUSED;
+  int written ATTRIBUTE_UNUSED;
   char filename[64];
   if (*wav_file) {
     if (rtc_WavSampleRate(*wav_file) == sample_rate)