diff --git a/src/daemon/rrset-factory.cpp b/src/daemon/rrset-factory.cpp
index d4a0d87..710a513 100644
--- a/src/daemon/rrset-factory.cpp
+++ b/src/daemon/rrset-factory.cpp
@@ -108,7 +108,7 @@
   try {
     CertHelper::getCertificate(m_keyChain, identity, certName);
     return true;
-  } catch (ndn::security::Pib::Error) {
+  } catch (const ndn::security::Pib::Error&) {
     return false;
   }
 }