diff --git a/src/json-validator.cpp b/src/json-validator.cpp
index 2021471..ddbaaa1 100644
--- a/src/json-validator.cpp
+++ b/src/json-validator.cpp
@@ -863,7 +863,7 @@ class numeric : public schema
 	// multipleOf - if the remainder of the division is 0 -> OK
 	bool violates_multiple_of(T x) const
 	{
-		if constexpr (std::is_floating_point_v<T>) {
+		if constexpr (std::is_floating_point<T>::value) {
 			auto multiple = x / multipleOf_.second;
 			auto error = std::abs((multiple - std::round(multiple)) * multipleOf_.second);
 			return error > std::numeric_limits<T>::epsilon();