diff --git a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/config/WxPayConfig.java b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/config/WxPayConfig.java
index b87b3168a7825c805ec831d691ba490e3fba9b1d..2f78cc4e4bbbefc4d44b75840a23abbebf8f0b61 100644
--- a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/config/WxPayConfig.java
+++ b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/config/WxPayConfig.java
@@ -322,7 +322,7 @@ public class WxPayConfig {
     if (configContent != null) {
       inputStream = new ByteArrayInputStream(configContent);
     } else if (StringUtils.isNotEmpty(configString)) {
-      configContent = Base64.getDecoder().decode(configString);
+      configContent = configString.getBytes(StandardCharsets.UTF_8);
       inputStream = new ByteArrayInputStream(configContent);
     } else {
       if (StringUtils.isBlank(configPath)) {