diff --git a/apm-sniffer/apm-test-tools/src/main/java/org/apache/skywalking/apm/agent/test/tools/AgentServiceRule.java b/apm-sniffer/apm-test-tools/src/main/java/org/apache/skywalking/apm/agent/test/tools/AgentServiceRule.java
index 3e942d53d56e899cc447f823515443434d1e4777..0116e0dcbbe8ff3792653d746219910d33a0d844 100644
--- a/apm-sniffer/apm-test-tools/src/main/java/org/apache/skywalking/apm/agent/test/tools/AgentServiceRule.java
+++ b/apm-sniffer/apm-test-tools/src/main/java/org/apache/skywalking/apm/agent/test/tools/AgentServiceRule.java
@@ -38,7 +38,7 @@ public class AgentServiceRule extends ExternalResource {
         super.after();
         try {
             FieldSetter.setValue(
-                ServiceManager.INSTANCE.getClass(), "bootedServices", new HashMap<Class, BootService>());
+                ServiceManager.INSTANCE.getDeclaringClass(), "bootedServices", new HashMap<Class, BootService>());
             FieldSetter.setValue(
                 IgnoredTracerContext.ListenerManager.class, "LISTENERS", new LinkedList<TracingContextListener>());
             FieldSetter.setValue(