diff --git a/quic/quartc/test/quartc_peer_test.cc b/quic/quartc/test/quartc_peer_test.cc
index 513270e..3eca703 100644
--- a/quic/quartc/test/quartc_peer_test.cc
+++ b/quic/quartc/test/quartc_peer_test.cc
@@ -33,6 +33,7 @@
                             &server_transport_,
                             QuicBandwidth::FromKBitsPerSecond(512),
                             QuicTime::Delta::FromMilliseconds(100)) {
+    SetQuicReloadableFlag(quic_default_to_bbr, true);
     simulator_.set_random_generator(&rng_);
   }