diff --git a/http3/error_codes.go b/http3/error_codes.go
index 5b017fdea..ee8b8a0f5 100644
--- a/http3/error_codes.go
+++ b/http3/error_codes.go
@@ -23,6 +23,7 @@ const (
 	errorRequestRejected      errorCode = 0x10b
 	errorRequestCanceled      errorCode = 0x10c
 	errorRequestIncomplete    errorCode = 0x10d
+	errorMessageError         errorCode = 0x10e
 	errorConnectError         errorCode = 0x10f
 	errorVersionFallback      errorCode = 0x110
 )
@@ -57,6 +58,8 @@ func (e errorCode) String() string {
 		return "H3_REQUEST_CANCELLED"
 	case errorRequestIncomplete:
 		return "H3_INCOMPLETE_REQUEST"
+	case errorMessageError:
+		return "H3_MESSAGE_ERROR"
 	case errorConnectError:
 		return "H3_CONNECT_ERROR"
 	case errorVersionFallback: