diff --git a/quic/core/crypto/null_decrypter.cc b/quic/core/crypto/null_decrypter.cc
index 288d3c4..4934f62 100644
--- a/quic/core/crypto/null_decrypter.cc
+++ b/quic/core/crypto/null_decrypter.cc
@@ -28,6 +28,10 @@
   return iv.empty();
 }
 
+bool NullDecrypter::SetHeaderProtectionKey(QuicStringPiece key) {
+  return key.empty();
+}
+
 bool NullDecrypter::SetPreliminaryKey(QuicStringPiece key) {
   QUIC_BUG << "Should not be called";
   return false;
@@ -66,6 +70,11 @@
   return true;
 }
 
+std::string NullDecrypter::GenerateHeaderProtectionMask(
+    QuicDataReader* sample_reader) {
+  return std::string(5, 0);
+}
+
 size_t NullDecrypter::GetKeySize() const {
   return 0;
 }