diff --git a/src/os_win32.c b/src/os_win32.c
index 630df5a..af65906 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -1288,7 +1288,7 @@
     g_hConIn =	CreateFile("CONIN$", GENERIC_READ|GENERIC_WRITE,
 			FILE_SHARE_READ|FILE_SHARE_WRITE,
 			(LPSECURITY_ATTRIBUTES) NULL,
-			OPEN_EXISTING, (DWORD)NULL, (HANDLE)NULL);
+			OPEN_EXISTING, 0, (HANDLE)NULL);
     did_create_conin = TRUE;
 }