diff --git a/webrtc/modules/audio_processing/BUILD.gn b/webrtc/modules/audio_processing/BUILD.gn
index da121f312..97a212e55 100644
--- a/webrtc/modules/audio_processing/BUILD.gn
+++ b/webrtc/modules/audio_processing/BUILD.gn
@@ -172,6 +172,7 @@ source_set("audio_processing") {
   }
 
   if (rtc_use_openmax_dl) {
+    defines += [ "WEBRTC_BEAMFORMER" ]
     sources += [
       "beamformer/beamformer.cc",
       "beamformer/beamformer.h",