diff --git a/test/src/unit-concepts.cpp b/test/src/unit-concepts.cpp
index 9649af40..f28f0432 100644
--- a/test/src/unit-concepts.cpp
+++ b/test/src/unit-concepts.cpp
@@ -73,8 +73,8 @@ TEST_CASE("concepts")
         // X::size_type must return an unsigned integer
         CHECK((std::is_unsigned<json::size_type>::value));
         // X::size_type can represent any non-negative value of X::difference_type
-        CHECK(static_cast<json::size_type>(std::numeric_limits<json::difference_type>::max()) <=
-              std::numeric_limits<json::size_type>::max());
+        CHECK(static_cast<json::size_type>((std::numeric_limits<json::difference_type>::max)()) <=
+              (std::numeric_limits<json::size_type>::max)());
 
         // the expression "X u" has the post-condition "u.empty()"
         {
diff --git a/test/src/unit-regression.cpp b/test/src/unit-regression.cpp
index 6b7d90aa..88b12114 100644
--- a/test/src/unit-regression.cpp
+++ b/test/src/unit-regression.cpp
@@ -719,7 +719,7 @@ TEST_CASE("regression tests")
         };
 
         check_roundtrip(100000000000.1236);
-        check_roundtrip(std::numeric_limits<json::number_float_t>::max());
+        check_roundtrip((std::numeric_limits<json::number_float_t>::max)());
 
         // Some more numbers which fail to roundtrip when serialized with digits10 significand digits (instead of max_digits10)
         check_roundtrip(1.541888611948064e-17);