diff --git a/quic/quartc/test/quartc_peer.cc b/quic/quartc/test/quartc_peer.cc
index 036ba03..8aa1c1a 100644
--- a/quic/quartc/test/quartc_peer.cc
+++ b/quic/quartc/test/quartc_peer.cc
@@ -71,6 +71,7 @@
 
 void QuartcPeer::OnCryptoHandshakeComplete() {
   SetEnabled(true);
+  session_->SendPing();  // Hack to make probing work.
 }
 
 void QuartcPeer::OnConnectionWritable() {