diff --git a/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/logging/EasyLoggerTest.java b/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/logging/EasyLoggerTest.java
index 7288fd117..e3866d342 100644
--- a/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/logging/EasyLoggerTest.java
+++ b/apm-sniffer/apm-agent-core/src/test/java/org/skywalking/apm/agent/core/logging/EasyLoggerTest.java
@@ -66,8 +66,8 @@ public class EasyLoggerTest {
         Assert.assertTrue(logger.isWarnEnable());
         Assert.assertTrue(logger.isErrorEnable());
 
-        logger.debug("$$$$");
-        logger.debug("hello {}", "$$$$");
+        logger.debug("$^!@#*()");
+        logger.debug("hello {}", "!@#$%^&*(),./[]:;");
         logger.info("{}{}");
         logger.info("hello {}", "{}{}");