diff --git a/include/lcms2.h b/include/lcms2.h
index fd4ac7c..a99bdd2 100644
--- a/include/lcms2.h
+++ b/include/lcms2.h
@@ -227,6 +227,7 @@ typedef int                  cmsBool;
 
 
 // Calling convention -- this is hardly platform and compiler dependent
+#define CMS_DLL
 #ifdef CMS_IS_WINDOWS_
 #  if defined(CMS_DLL) || defined(CMS_DLL_BUILD)
 #     ifdef __BORLANDC__