diff --git a/src/libutil/config.cc b/src/libutil/config.cc
index 8454037f2..8fc700a2b 100644
--- a/src/libutil/config.cc
+++ b/src/libutil/config.cc
@@ -284,7 +284,7 @@ template class BaseSetting<unsigned int>;
 template class BaseSetting<long>;
 template class BaseSetting<unsigned long>;
 template class BaseSetting<long long>;
-template class BaseSetting<uint64_t>;
+template class BaseSetting<unsigned long long>;
 template class BaseSetting<bool>;
 template class BaseSetting<std::string>;
 template class BaseSetting<Strings>;
diff --git a/src/libutil/json.cc b/src/libutil/json.cc
index 104b99e6d..01331947e 100644
--- a/src/libutil/json.cc
+++ b/src/libutil/json.cc
@@ -29,7 +29,7 @@ template<> void toJSON<unsigned int>(std::ostream & str, const unsigned int & n)
 template<> void toJSON<long>(std::ostream & str, const long & n) { str << n; }
 template<> void toJSON<unsigned long>(std::ostream & str, const unsigned long & n) { str << n; }
 template<> void toJSON<long long>(std::ostream & str, const long long & n) { str << n; }
-template<> void toJSON<uint64_t>(std::ostream & str, const uint64_t & n) { str << n; }
+template<> void toJSON<unsigned long long>(std::ostream & str, const unsigned long long & n) { str << n; }
 template<> void toJSON<float>(std::ostream & str, const float & n) { str << n; }
 template<> void toJSON<double>(std::ostream & str, const double & n) { str << n; }