diff --git a/server/handle_oauth_par.go b/server/handle_oauth_par.go
index 37e3490..7c83571 100644
--- a/server/handle_oauth_par.go
+++ b/server/handle_oauth_par.go
@@ -41,7 +41,7 @@ func (s *Server) handleOauthPar(e echo.Context) error {
 		AllowMissingDpopProof: true,
 	})
 	if err != nil {
-		s.logger.Error("error authenticating client", "error", err)
+		s.logger.Error("error authenticating client", "client_id", parRequest.ClientID, "error", err)
 		return helpers.InputError(e, to.StringPtr(err.Error()))
 	}
 
diff --git a/server/handle_oauth_token.go b/server/handle_oauth_token.go
index 718bd16..fe10f85 100644
--- a/server/handle_oauth_token.go
+++ b/server/handle_oauth_token.go
@@ -52,7 +52,7 @@ func (s *Server) handleOauthToken(e echo.Context) error {
 		AllowMissingDpopProof: true,
 	})
 	if err != nil {
-		s.logger.Error("error authenticating client", "error", err)
+		s.logger.Error("error authenticating client", "client_id", req.ClientID, "error", err)
 		return helpers.InputError(e, to.StringPtr(err.Error()))
 	}