diff --git a/quic/test_tools/fake_proof_source.cc b/quic/test_tools/fake_proof_source.cc
index 032560e..3763bcc 100644
--- a/quic/test_tools/fake_proof_source.cc
+++ b/quic/test_tools/fake_proof_source.cc
@@ -114,9 +114,17 @@
 }
 
 ProofSource::TicketCrypter* FakeProofSource::SessionTicketCrypter() {
+  if (ticket_crypter_) {
+    return ticket_crypter_.get();
+  }
   return delegate_->SessionTicketCrypter();
 }
 
+void FakeProofSource::SetTicketCrypter(
+    std::unique_ptr<TicketCrypter> ticket_crypter) {
+  ticket_crypter_ = std::move(ticket_crypter);
+}
+
 int FakeProofSource::NumPendingCallbacks() const {
   return pending_ops_.size();
 }