diff --git a/include/minix/ioctl.h b/include/minix/ioctl.h
index fe18d9d47..f679fff01 100644
--- a/include/minix/ioctl.h
+++ b/include/minix/ioctl.h
@@ -53,7 +53,7 @@
 #define _MINIX_IOCTL_SIZE_BIG(i)	(((i) >> 8) & _IOCPARM_MASK_BIG)
 
 __BEGIN_DECLS
-int ioctl(int _fd, int _request, void *_data);
+int ioctl(int _fd, unsigned long _request, void *_data);
 __END_DECLS
 
 #endif /* _M_IOCTL_H */
diff --git a/lib/libc/sys-minix/ioctl.c b/lib/libc/sys-minix/ioctl.c
index c61478473..32d4252e8 100644
--- a/lib/libc/sys-minix/ioctl.c
+++ b/lib/libc/sys-minix/ioctl.c
@@ -46,7 +46,7 @@ static void rewrite_i2c_minix_to_netbsd(i2c_ioctl_exec_t *out,
 
 int ioctl(fd, request, data)
 int fd;
-int request;
+unsigned long request;
 void *data;
 {
   int r, request_save;