diff --git a/testable-agent/src/main/java/com/alibaba/testable/agent/transformer/TestableClassTransformer.java b/testable-agent/src/main/java/com/alibaba/testable/agent/transformer/TestableClassTransformer.java
index 8ef08a9..697ffb3 100644
--- a/testable-agent/src/main/java/com/alibaba/testable/agent/transformer/TestableClassTransformer.java
+++ b/testable-agent/src/main/java/com/alibaba/testable/agent/transformer/TestableClassTransformer.java
@@ -38,7 +38,7 @@ public class TestableClassTransformer implements ClassFileTransformer {
     /**
      * Just avoid spend time to scan those surely non-user classes, should keep these lists as tiny as possible
      */
-    private final String[] BLACKLIST_PREFIXES = new String[] { "sun/", "com/sun/", "org/gradle/" };
+    private final String[] BLACKLIST_PREFIXES = new String[] { "sun/", "com/sun/", "javax/crypto", "org/gradle/" };
 
     public MockClassParser mockClassParser = new MockClassParser();