diff --git a/format.go b/format.go
index 199f6f8..6f1cde3 100644
--- a/format.go
+++ b/format.go
@@ -9,7 +9,7 @@ const logTemplate = "[%s] %s : %s - %s\n"
 func format(logEvent LogEvent) string {
 	data := logEvent.Ts.Format("2006-01-02 15:04:05")
 	msg := fmt.Sprint(logEvent.Data...)
-	ret := fmt.Sprintf(logTemplate, data, logEvent.Category getLogLevelStr(logEvent.Level), msg)
+	ret := fmt.Sprintf(logTemplate, data, logEvent.Category, getLogLevelStr(logEvent.Level), msg)
 	return ret
 }