diff --git a/api/BUILD.gn b/api/BUILD.gn
index fa9279004a..767056fb44 100644
--- a/api/BUILD.gn
+++ b/api/BUILD.gn
@@ -835,6 +835,7 @@ if (rtc_include_tests) {
   }
 
   rtc_source_set("mock_audio_sink") {
+    visibility = [ "*" ]
     testonly = true
     sources = [ "test/mock_audio_sink.h" ]