diff --git a/quic/test_tools/failing_proof_source.cc b/quic/test_tools/failing_proof_source.cc
index 339b793..60b6a95 100644
--- a/quic/test_tools/failing_proof_source.cc
+++ b/quic/test_tools/failing_proof_source.cc
@@ -7,26 +7,26 @@
 namespace quic {
 namespace test {
 
-void FailingProofSource::GetProof(const QuicSocketAddress& server_address,
-                                  const std::string& hostname,
-                                  const std::string& server_config,
-                                  QuicTransportVersion transport_version,
-                                  QuicStringPiece chlo_hash,
+void FailingProofSource::GetProof(const QuicSocketAddress& /*server_address*/,
+                                  const std::string& /*hostname*/,
+                                  const std::string& /*server_config*/,
+                                  QuicTransportVersion /*transport_version*/,
+                                  QuicStringPiece /*chlo_hash*/,
                                   std::unique_ptr<Callback> callback) {
   callback->Run(false, nullptr, QuicCryptoProof(), nullptr);
 }
 
 QuicReferenceCountedPointer<ProofSource::Chain>
-FailingProofSource::GetCertChain(const QuicSocketAddress& server_address,
-                                 const std::string& hostname) {
+FailingProofSource::GetCertChain(const QuicSocketAddress& /*server_address*/,
+                                 const std::string& /*hostname*/) {
   return QuicReferenceCountedPointer<Chain>();
 }
 
 void FailingProofSource::ComputeTlsSignature(
-    const QuicSocketAddress& server_address,
-    const std::string& hostname,
-    uint16_t signature_algorithm,
-    QuicStringPiece in,
+    const QuicSocketAddress& /*server_address*/,
+    const std::string& /*hostname*/,
+    uint16_t /*signature_algorithm*/,
+    QuicStringPiece /*in*/,
     std::unique_ptr<SignatureCallback> callback) {
   callback->Run(false, "");
 }