diff --git a/dlls/glut32/glut.c b/dlls/glut32/glut.c
index 0d50e6f4b6d..93a94ea6155 100644
--- a/dlls/glut32/glut.c
+++ b/dlls/glut32/glut.c
@@ -16,7 +16,9 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
+#include <stdarg.h>
 #include "windef.h"
+#include "winbase.h"
 
 static void (*__glutExitFunc)(int ret) = 0;
 
diff --git a/include/winbase.h b/include/winbase.h
index 9ea16d8f966..f802f3547e1 100644
--- a/include/winbase.h
+++ b/include/winbase.h
@@ -2344,6 +2344,11 @@ static inline PVOID WINAPI InterlockedExchangePointer( PVOID volatile *dest, PVO
 /* If this is not declared, we cannot compile many sources written with C++. */
 int WINAPI WinMain(HINSTANCE,HINSTANCE,LPSTR,int);
 
+#ifdef __WINESRC__
+/* shouldn't be here, but is nice for type checking */
+BOOL WINAPI DllMain( HINSTANCE hinst, DWORD reason, LPVOID reserved ) DECLSPEC_HIDDEN;
+#endif
+
 #ifdef __cplusplus
 }
 #endif