About inconsistent dll linkage

How can I remove this link warning? You can see code segment that causes this warning.

static AFX_EXTENSION_MODULE GuiCtrlsDLL = { NULL, NULL };
//bla bla
// Exported DLL initialization is run in context of running application
    extern "C" void WINAPI InitGuiCtrlsDLL()
    {
     // create a new CDynLinkLibrary for this app
      new CDynLinkLibrary(GuiCtrlsDLL);
     // nothing more to do
    }

warning C4273: 'InitGuiCtrlsDLL' : inconsistent dll linkage

I have also export and import definitions, like:

#ifdef _GUICTRLS
   #define GUI_CTRLS_EXPORT __declspec(dllexport)
#else
   #define GUI_CTRLS_EXPORT  __declspec(dllimport)
#endif