diff --git a/pc/peer_connection_integrationtest.cc b/pc/peer_connection_integrationtest.cc
index b3ca36123f..f36ba1e52f 100644
--- a/pc/peer_connection_integrationtest.cc
+++ b/pc/peer_connection_integrationtest.cc
@@ -4863,6 +4863,7 @@ TEST_P(PeerConnectionIntegrationTest, GetSourcesVideo) {
   ASSERT_EQ(receiver->media_type(), cricket::MEDIA_TYPE_VIDEO);
   auto sources = receiver->GetSources();
   ASSERT_GT(receiver->GetParameters().encodings.size(), 0u);
+  ASSERT_GT(sources.size(), 0u);
   EXPECT_EQ(receiver->GetParameters().encodings[0].ssrc,
             sources[0].source_id());
   EXPECT_EQ(webrtc::RtpSourceType::SSRC, sources[0].source_type());