diff --git a/src/json-schema.hpp b/src/json-schema.hpp
index 2817fe3..d38a308 100644
--- a/src/json-schema.hpp
+++ b/src/json-schema.hpp
@@ -27,10 +27,12 @@
 #define NLOHMANN_JSON_SCHEMA_HPP__
 
 #ifdef _WIN32
-#    ifdef JSON_SCHEMA_VALIDATOR_EXPORTS
+#    if defined(JSON_SCHEMA_VALIDATOR_EXPORTS)
 #        define JSON_SCHEMA_VALIDATOR_API __declspec(dllexport)
-#    else
+#    elif defined(JSON_SCHEMA_VALIDATOR_IMPORTS)
 #        define JSON_SCHEMA_VALIDATOR_API __declspec(dllimport)
+#    else
+#        define JSON_SCHEMA_VALIDATOR_API
 #    endif
 #else
 #    define JSON_SCHEMA_VALIDATOR_API