diff --git a/objc/objc-visibility.h b/objc/objc-visibility.h
new file mode 100644
index 0000000..0c4ef1b
--- /dev/null
+++ b/objc/objc-visibility.h
@@ -0,0 +1,9 @@
+#if defined _WIN32 || defined __CYGWIN__
+#	ifdef __OBJC_RUNTIME_INTERNAL__
+#		define PUBLIC __attribute__((dllexport))
+#	else
+#		define PUBLIC __attribute__((dllimport))
+#	endif
+#else
+#	define PUBLIC
+#endif