diff --git a/modules/audio_device/BUILD.gn b/modules/audio_device/BUILD.gn
index 4f701e4be8..34686be9d7 100644
--- a/modules/audio_device/BUILD.gn
+++ b/modules/audio_device/BUILD.gn
@@ -351,6 +351,7 @@ if (is_mac) {
 }
 
 rtc_source_set("mock_audio_device") {
+  visibility = [ "*" ]
   testonly = true
   sources = [
     "include/mock_audio_device.h",