diff --git a/include/ndn-cpp/security/policy/policy-manager.hpp b/include/ndn-cpp/security/policy/policy-manager.hpp
index 5b3609d..f84a505 100644
--- a/include/ndn-cpp/security/policy/policy-manager.hpp
+++ b/include/ndn-cpp/security/policy/policy-manager.hpp
@@ -54,7 +54,7 @@
    */
   virtual ptr_lib::shared_ptr<ValidationRequest>
   checkVerificationPolicy
-    (const ptr_lib::shared_ptr<Data>& data, const int& stepCount, const OnVerified& onVerified, const OnVerifyFailed& onVerifyFailed) = 0;
+    (const ptr_lib::shared_ptr<Data>& data, int stepCount, const OnVerified& onVerified, const OnVerifyFailed& onVerifyFailed) = 0;
     
   /**
    * Check if the signing certificate name and data name satisfy the signing policy.