diff --git a/test/unittest/enable_verity_test.cpp b/test/unittest/enable_verity_test.cpp
index 09e3d92a1f28e2ad1255279dda57678cea14f82d..c6c2d9b075566c45586e7a7b45103c9b9fda8ff8 100644
--- a/test/unittest/enable_verity_test.cpp
+++ b/test/unittest/enable_verity_test.cpp
@@ -330,6 +330,7 @@ static void EnableExpandedTamperFile(const std::string &filePath,
 
     // Enable successully but cannot read
     EXPECT_EQ(EnableVerityOnOneFile(expandFilePath, &arg), 0);
+    SaveStringToFile(DROP_CACHE_PROC_PATH, DROP_ALL_CACHE_LEVEL);
     ByteBuffer tmp;
     EXPECT_EQ(ReadDataFromFile(expandFilePath, tmp), false);