diff --git a/src/repo.cpp b/src/repo.cpp
index 64287e2..0ec3837 100644
--- a/src/repo.cpp
+++ b/src/repo.cpp
@@ -106,7 +106,7 @@
 
   repoConfig.validatorNode = repoConf.get_child("validator");
 
-  repoConfig.nMaxPackets = repoConf.get<int>("storage.max-packets");
+  repoConfig.nMaxPackets = repoConf.get<uint64_t>("storage.max-packets");
 
   return repoConfig;
 }
diff --git a/src/repo.hpp b/src/repo.hpp
index 3e7e89d..754a63c 100644
--- a/src/repo.hpp
+++ b/src/repo.hpp
@@ -45,7 +45,7 @@
   std::vector<ndn::Name> dataPrefixes;
   std::vector<ndn::Name> repoPrefixes;
   std::vector<std::pair<std::string, std::string> > tcpBulkInsertEndpoints;
-  int64_t nMaxPackets;
+  uint64_t nMaxPackets;
   boost::property_tree::ptree validatorNode;
 };