diff --git a/include/chaiscript/utility/json_wrap.hpp b/include/chaiscript/utility/json_wrap.hpp
index 05b9e404..656bf21d 100644
--- a/include/chaiscript/utility/json_wrap.hpp
+++ b/include/chaiscript/utility/json_wrap.hpp
@@ -110,7 +110,7 @@ namespace chaiscript
           {
             return json::JSON(bn.get_as<double>());
           } else {
-            return json::JSON(bn.get_as<long>());
+            return json::JSON(bn.get_as<std::int64_t>());
           }
         } catch (const chaiscript::detail::exception::bad_any_cast &) {
           // not a number
diff --git a/unittests/json_3.chai b/unittests/json_3.chai
index 11ce7dcb..1308c492 100644
--- a/unittests/json_3.chai
+++ b/unittests/json_3.chai
@@ -1,2 +1,3 @@
 assert_equal(from_json("100"), 100)
 assert_equal(from_json("-100"), -100)
+assert_equal(to_json(4294967295), "4294967295")