diff --git a/hutool-extra/src/main/java/cn/hutool/extra/qrcode/QrSVG.java b/hutool-extra/src/main/java/cn/hutool/extra/qrcode/QrSVG.java
index ae5a90b59..8a2001f81 100644
--- a/hutool-extra/src/main/java/cn/hutool/extra/qrcode/QrSVG.java
+++ b/hutool-extra/src/main/java/cn/hutool/extra/qrcode/QrSVG.java
@@ -61,7 +61,7 @@ public class QrSVG {
 
 		}
 
-		StringBuilder result = StrUtil.builder();
+		final StringBuilder result = StrUtil.builder();
 		result.append("<svg width=\"").append(qrWidth).append("\" height=\"").append(qrHeight).append("\" \n");
 		if (backColor != null) {
 			Color back = new Color(backColor, true);