diff --git a/internal/log/config.go b/internal/log/config.go
index 60c5715..2c50cc0 100644
--- a/internal/log/config.go
+++ b/internal/log/config.go
@@ -15,6 +15,9 @@ type Config struct {
 	// Directory where the log files are stored.
 	Directory string `yaml:"directory" mapstructure:"directory"`
 
+	// Timestamp format when rotation files.
+	FileTimestampFormat string `yaml:"file_timestamp_format" mapstructure:"file_timestamp_format"`
+
 	// Maximum filesize, the log is rotated when this size is exceeded.
 	MaxFileSize types.Size `yaml:"maxfilesize" mapstructure:"maxfilesize"`