diff --git a/log/default.go b/log/default.go
index d8014489..a8aaff87 100644
--- a/log/default.go
+++ b/log/default.go
@@ -52,7 +52,7 @@ func (l *simpleLogger) Log(ctx context.Context, level Level, args []any) {
 	if level > l.level {
 		return
 	}
-	message := l.formatter.Format(ctx, level, l.tag, F.ToString(args...), time.Now()) + "\n"
+	message := l.formatter.Format(ctx, level, l.tag, F.ToString(args...), time.Now())
 	if level == LevelPanic {
 		panic(message)
 	}
diff --git a/log/format.go b/log/format.go
index ef69d821..96e0364b 100644
--- a/log/format.go
+++ b/log/format.go
@@ -75,7 +75,10 @@ func (f Formatter) Format(ctx context.Context, level Level, tag string, message
 	default:
 		message = levelString + "[" + xd(int(timestamp.Sub(f.BaseTime)/time.Second), 4) + "] " + message
 	}
-	return message + "\n"
+	if message[len(message)-1] != '\n' {
+		message += "\n"
+	}
+	return message
 }
 
 func (f Formatter) FormatWithSimple(ctx context.Context, level Level, tag string, message string, timestamp time.Time) (string, string) {
@@ -137,7 +140,10 @@ func (f Formatter) FormatWithSimple(ctx context.Context, level Level, tag string
 	default:
 		message = levelString + "[" + xd(int(timestamp.Sub(f.BaseTime)/time.Second), 4) + "] " + message
 	}
-	return message + "\n", messageSimple
+	if message[len(message)-1] != '\n' {
+		message += "\n"
+	}
+	return message, messageSimple
 }
 
 func xd(value int, x int) string {