diff --git a/libsrc/include/mydefs.hpp b/libsrc/include/mydefs.hpp
index 12c6e60c..002660b9 100644
--- a/libsrc/include/mydefs.hpp
+++ b/libsrc/include/mydefs.hpp
@@ -25,7 +25,7 @@
 
 
 #ifdef WIN32
-   #ifdef NGINTERFACE_EXPORTS
+   #if NGINTERFACE_EXPORTS || NGLIB_EXPORTS || nglib_EXPORTS
       #define DLL_HEADER   __declspec(dllexport)
    #else
       #define DLL_HEADER   __declspec(dllimport)
diff --git a/libsrc/include/nginterface.h b/libsrc/include/nginterface.h
index 00d77d91..85ae8d6d 100644
--- a/libsrc/include/nginterface.h
+++ b/libsrc/include/nginterface.h
@@ -17,7 +17,7 @@
 */
 
 #ifdef WIN32
-   #ifdef NGINTERFACE_EXPORTS
+   #if NGINTERFACE_EXPORTS || NGLIB_EXPORTS || nglib_EXPORTS
       #define DLL_HEADER   __declspec(dllexport)
    #else
       #define DLL_HEADER   __declspec(dllimport)