diff --git a/webrtc/modules/video_coding/main/source/video_sender_unittest.cc b/webrtc/modules/video_coding/main/source/video_sender_unittest.cc
index 1f25aed719..67b3e7aecc 100644
--- a/webrtc/modules/video_coding/main/source/video_sender_unittest.cc
+++ b/webrtc/modules/video_coding/main/source/video_sender_unittest.cc
@@ -345,6 +345,8 @@ class TestVideoSenderWithVp8 : public TestVideoSender {
   void InsertFrames(float framerate, float seconds) {
     for (int i = 0; i < seconds * framerate; ++i) {
       clock_.AdvanceTimeMilliseconds(1000.0f / framerate);
+      EXPECT_CALL(post_encode_callback_, Encoded(_, NULL, NULL))
+          .WillOnce(Return(0));
       AddFrame();
 
       // SetChannelParameters needs to be called frequently to propagate