diff --git a/testable-agent/src/main/java/com/alibaba/testable/agent/constant/ConstPool.java b/testable-agent/src/main/java/com/alibaba/testable/agent/constant/ConstPool.java
index 1ac673e..e12e209 100644
--- a/testable-agent/src/main/java/com/alibaba/testable/agent/constant/ConstPool.java
+++ b/testable-agent/src/main/java/com/alibaba/testable/agent/constant/ConstPool.java
@@ -17,6 +17,8 @@ public class ConstPool {
     public static final String MOCK_CONSTRUCTOR = "com.alibaba.testable.core.annotation.MockConstructor";
     public static final String TESTABLE_MOCK = "com.alibaba.testable.core.annotation.TestableMock";
 
+    public static final String CGLIB_CLASS_INFIX = "$$EnhancerByCGLIB$$";
+
     /**
      * Name of the constructor method
      */
diff --git a/testable-agent/src/main/java/com/alibaba/testable/agent/util/ClassUtil.java b/testable-agent/src/main/java/com/alibaba/testable/agent/util/ClassUtil.java
index 0d0cec1..f7a9870 100644
--- a/testable-agent/src/main/java/com/alibaba/testable/agent/util/ClassUtil.java
+++ b/testable-agent/src/main/java/com/alibaba/testable/agent/util/ClassUtil.java
@@ -79,6 +79,11 @@ public class ClassUtil {
      * @return test class name
      */
     public static String getTestClassName(String sourceClassName) {
+        // check the class if generated by CGLIB
+        int idx = sourceClassName.indexOf(ConstPool.CGLIB_CLASS_INFIX);
+        if (idx != -1) {
+            sourceClassName = sourceClassName.substring(0, idx);
+        }
         return sourceClassName + ConstPool.TEST_POSTFIX;
     }