diff --git a/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/context/IgnoredTracerContext.java b/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/context/IgnoredTracerContext.java
index 3e0568fc6..d9ac90edb 100644
--- a/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/context/IgnoredTracerContext.java
+++ b/apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/context/IgnoredTracerContext.java
@@ -65,7 +65,7 @@ public class IgnoredTracerContext implements AbstractTracerContext {
 
     @Override
     public String getReadablePrimaryTraceId() {
-        return "[Ignored Trace]";
+        return "Ignored_Trace";
     }
 
     @Override