diff --git a/quic/quartc/quartc_endpoint_test.cc b/quic/quartc/quartc_endpoint_test.cc
index 8506067..d2f9420 100644
--- a/quic/quartc/quartc_endpoint_test.cc
+++ b/quic/quartc/quartc_endpoint_test.cc
@@ -49,7 +49,11 @@
             simulator_.GetRandomGenerator(),
             &client_endpoint_delegate_,
             QuartcSessionConfig(),
-            /*serialized_server_config=*/"")) {}
+            /*serialized_server_config=*/"")) {
+    // Make sure these versions are enabled since some tests use them.
+    SetQuicReloadableFlag(quic_disable_version_q043, false);
+    SetQuicReloadableFlag(quic_disable_version_q046, false);
+  }
 
   simulator::Simulator simulator_;
 
diff --git a/quic/quartc/quartc_multiplexer_test.cc b/quic/quartc/quartc_multiplexer_test.cc
index 3cc088b..9b989be 100644
--- a/quic/quartc/quartc_multiplexer_test.cc
+++ b/quic/quartc/quartc_multiplexer_test.cc
@@ -199,8 +199,10 @@
             simulator_.GetRandomGenerator(),
             &server_multiplexer_,
             quic::QuartcSessionConfig())) {
+    quic::test::QuicEnableDefaultEnabledVersions();
     // TODO(b/134175506): Remove when IETF QUIC supports receive timestamps.
-    SetQuicReloadableFlag(quic_enable_version_99, false);
+    SetQuicReloadableFlag(quic_enable_version_q099, false);
+    SetQuicReloadableFlag(quic_enable_version_t099, false);
   }
 
   void Connect() {
diff --git a/quic/quartc/quartc_session_test.cc b/quic/quartc/quartc_session_test.cc
index 956073b..195baa4 100644
--- a/quic/quartc/quartc_session_test.cc
+++ b/quic/quartc/quartc_session_test.cc
@@ -51,6 +51,11 @@
   ~QuartcSessionTest() override {}
 
   void Init(bool create_client_endpoint = true) {
+    quic::test::QuicEnableDefaultEnabledVersions();
+    // TODO(b/134175506): Remove when IETF QUIC supports receive timestamps.
+    SetQuicReloadableFlag(quic_enable_version_q099, false);
+    SetQuicReloadableFlag(quic_enable_version_t099, false);
+
     client_transport_ =
         std::make_unique<simulator::SimulatedQuartcPacketTransport>(
             &simulator_, "client_transport", "server_transport",
@@ -336,7 +341,8 @@
 
 TEST_F(QuartcSessionTest, SendReceiveMessages) {
   // TODO(b/134175506): Remove when IETF QUIC supports receive timestamps.
-  SetQuicReloadableFlag(quic_enable_version_99, false);
+  SetQuicReloadableFlag(quic_enable_version_q099, false);
+  SetQuicReloadableFlag(quic_enable_version_t099, false);
 
   CreateClientAndServerSessions(QuartcSessionConfig());
   AwaitHandshake();
@@ -345,7 +351,8 @@
 
 TEST_F(QuartcSessionTest, SendReceiveQueuedMessages) {
   // TODO(b/134175506): Remove when IETF QUIC supports receive timestamps.
-  SetQuicReloadableFlag(quic_enable_version_99, false);
+  SetQuicReloadableFlag(quic_enable_version_q099, false);
+  SetQuicReloadableFlag(quic_enable_version_t099, false);
 
   CreateClientAndServerSessions(QuartcSessionConfig());
   AwaitHandshake();
@@ -406,7 +413,8 @@
 
 TEST_F(QuartcSessionTest, PreSharedKeyHandshake) {
   // TODO(b/134175506): Remove when IETF QUIC supports receive timestamps.
-  SetQuicReloadableFlag(quic_enable_version_99, false);
+  SetQuicReloadableFlag(quic_enable_version_q099, false);
+  SetQuicReloadableFlag(quic_enable_version_t099, false);
 
   QuartcSessionConfig config;
   config.pre_shared_key = "foo";
@@ -552,7 +560,8 @@
 
 TEST_F(QuartcSessionTest, LostDatagramNotifications) {
   // TODO(b/134175506): Remove when IETF QUIC supports receive timestamps.
-  SetQuicReloadableFlag(quic_enable_version_99, false);
+  SetQuicReloadableFlag(quic_enable_version_q099, false);
+  SetQuicReloadableFlag(quic_enable_version_t099, false);
 
   // Disable tail loss probe, otherwise test maybe flaky because dropped
   // message will be retransmitted to detect tail loss.