diff --git a/server/embed/config.go b/server/embed/config.go
index 2d1edf05c822..4fa177b46a62 100644
--- a/server/embed/config.go
+++ b/server/embed/config.go
@@ -1009,7 +1009,7 @@ func (cfg *Config) Validate() error {
 	// TODO: delete in v3.7
 	for oldFlag, newFlag := range experimentalNonBoolFlagMigrationMap {
 		if cfg.FlagsExplicitlySet[oldFlag] && cfg.FlagsExplicitlySet[newFlag] {
-			return fmt.Errorf("cannot set %s and %s at the same time in the config file, please use %s only", oldFlag, newFlag, newFlag)
+			return fmt.Errorf("cannot set --%s and --%s at the same time, please use --%s only", oldFlag, newFlag, newFlag)
 		}
 	}