diff --git a/common/src/main/java/org/apache/rocketmq/common/utils/BinaryUtil.java b/common/src/main/java/org/apache/rocketmq/common/utils/BinaryUtil.java
index 7b4b24819c6..68d15e0708a 100644
--- a/common/src/main/java/org/apache/rocketmq/common/utils/BinaryUtil.java
+++ b/common/src/main/java/org/apache/rocketmq/common/utils/BinaryUtil.java
@@ -54,7 +54,7 @@ public static boolean isAscii(byte[] subject) {
             return false;
         }
         for (byte b : subject) {
-            if ((b & 0x80) != 0) {
+            if (b < 32 || b > 126) {
                 return false;
             }
         }