diff --git a/TopologicCore/include/Utilities.h b/TopologicCore/include/Utilities.h
index b0037f6..7fd9edf 100644
--- a/TopologicCore/include/Utilities.h
+++ b/TopologicCore/include/Utilities.h
@@ -18,11 +18,15 @@
 
 #include <TopoDS_Shape.hxx>
 
+#ifdef WIN32
 #ifdef TOPOLOGICCORE_EXPORTS
 #define TOPOLOGIC_API __declspec(dllexport)
 #else
 #define TOPOLOGIC_API __declspec(dllimport)
 #endif
+#else
+#define TOPOLOGIC_API
+#endif
 
 namespace TopologicCore {
 	enum TopologyType