diff --git a/include/nlohmann/detail/conversions/to_json.hpp b/include/nlohmann/detail/conversions/to_json.hpp
index b45004fd4..62a82b47d 100644
--- a/include/nlohmann/detail/conversions/to_json.hpp
+++ b/include/nlohmann/detail/conversions/to_json.hpp
@@ -175,7 +175,7 @@ struct external_constructor<value_t::array>
         j.m_type = value_t::array;
         j.m_value = value_t::array;
         j.m_value.array->resize(arr.size());
-        if (arr.size() > 0)
+        if (!arr.empty())
         {
             std::copy(std::begin(arr), std::end(arr), j.m_value.array->begin());
         }
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 41c171117..9c4e4a515 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -4164,7 +4164,7 @@ struct external_constructor<value_t::array>
         j.m_type = value_t::array;
         j.m_value = value_t::array;
         j.m_value.array->resize(arr.size());
-        if (arr.size() > 0)
+        if (!arr.empty())
         {
             std::copy(std::begin(arr), std::end(arr), j.m_value.array->begin());
         }