diff --git a/include/dio.h b/include/dio.h
index 6ce4b9839..fde6142ec 100644
--- a/include/dio.h
+++ b/include/dio.h
@@ -37,19 +37,13 @@ typedef unsigned int  _sectsize_t;
 
 
 #ifdef __ATARI__
-
 #define _dio_query_sectsize(x) ((_sectsize_t)128)
-#define _dio_open(x)
-#define _dio_close(x)
-
 #else
-
 #define _dio_query_sectsize(x) ((_sectsize_t)256)
-extern unsigned char __fastcall__ _dio_open        (_driveid_t drive_id);
-extern unsigned char __fastcall__ _dio_close       (_driveid_t drive_id);
-
 #endif
 
+extern unsigned char __fastcall__ _dio_open        (_driveid_t drive_id);
+extern unsigned char __fastcall__ _dio_close       (_driveid_t drive_id);
 extern unsigned char __fastcall__ _dio_format      (_driveid_t drive_id, unsigned int format);
 extern unsigned char __fastcall__ _dio_read        (_driveid_t drive_id, _sectnum_t sect_num, void *buffer);
 extern unsigned char __fastcall__ _dio_write       (_driveid_t drive_id, _sectnum_t sect_num, void *buffer);