diff --git a/include/libremidi/config.hpp b/include/libremidi/config.hpp
index cd2e43ef..efb6f960 100644
--- a/include/libremidi/config.hpp
+++ b/include/libremidi/config.hpp
@@ -46,7 +46,7 @@
 
 // Dynamic exports
 #if defined(LIBREMIDI_EXPORTS) || defined(LIBREMIDI_MODULE_BUILD)
-  #if defined(_MSC_VER)
+  #if defined(_WIN32)
     #define LIBREMIDI_EXPORT __declspec(dllexport)
   #elif defined(__GNUC__) || defined(__clang__)
     #define LIBREMIDI_EXPORT __attribute__((visibility("default")))
diff --git a/include/libremidi/libremidi-c.h b/include/libremidi/libremidi-c.h
index bb9e60bc..14fa9f65 100644
--- a/include/libremidi/libremidi-c.h
+++ b/include/libremidi/libremidi-c.h
@@ -6,7 +6,7 @@
 #include <stdint.h>
 
 #if defined(LIBREMIDI_EXPORTS)
-  #if defined(_MSC_VER)
+  #if defined(_WIN32)
     #define LIBREMIDI_EXPORT __declspec(dllexport)
   #elif defined(__GNUC__) || defined(__clang__)
     #define LIBREMIDI_EXPORT __attribute__((visibility("default")))