diff --git a/Src/IACore/inc/hpp/IACore/Definitions.hpp b/Src/IACore/inc/hpp/IACore/Definitions.hpp
index 2f35f41..58767f5 100644
--- a/Src/IACore/inc/hpp/IACore/Definitions.hpp
+++ b/Src/IACore/inc/hpp/IACore/Definitions.hpp
@@ -152,6 +152,17 @@
 #define IA_VERSION_TYPE UINT64
 #define IA_MAKE_VERSION(major, minor, patch) ((static_cast<UINT64>(major) & 0xFFFFFF) << 40) | ((static_cast<UINT64>(minor) & 0xFFFFFF) << 16) | (static_cast<UINT64>(patch) & 0xFFFF)
 
+#if defined(_MSC_VER)
+    #define IA_DLL_EXPORT __declspec(dllexport)
+    #define IA_DLL_IMPORT __declspec(dllimport)
+#elif defined(__GNUC__)
+    #define IA_DLL_EXPORT __attribute__((visibility("default")))
+    #define IA_DLL_IMPORT
+#else
+    #define IA_DLL_EXPORT
+    #define IA_DLL_IMPORT
+#endif
+
 #define __CC_BLACK   "\033[30m"
 #define __CC_RED     "\033[31m"
 #define __CC_GREEN   "\033[32m"