diff --git a/quic/core/quic_versions.h b/quic/core/quic_versions.h
index cb35d6d..6d6456f 100644
--- a/quic/core/quic_versions.h
+++ b/quic/core/quic_versions.h
@@ -154,7 +154,11 @@
   constexpr ParsedQuicVersion(HandshakeProtocol handshake_protocol,
                               QuicTransportVersion transport_version)
       : handshake_protocol(handshake_protocol),
-        transport_version(transport_version) {}
+        transport_version(transport_version) {
+    DCHECK(ParsedQuicVersionIsValid(handshake_protocol, transport_version))
+        << QuicVersionToString(transport_version) << " "
+        << HandshakeProtocolToString(handshake_protocol);
+  }
 
   constexpr ParsedQuicVersion(const ParsedQuicVersion& other)
       : ParsedQuicVersion(other.handshake_protocol, other.transport_version) {}