diff --git a/include/minix/driver.h b/include/minix/driver.h
index d523ced35..0aeee34f1 100644
--- a/include/minix/driver.h
+++ b/include/minix/driver.h
@@ -56,7 +56,7 @@ struct device {
 #define DRIVER_STD	0	/* Use the standard reply protocol */
 #define DRIVER_ASYN	1	/* Use the new asynchronous protocol */
 
-#define MAX_NR_OPEN_DEVICES 16
+#define MAX_NR_OPEN_DEVICES 256
 
 #define IS_DEV_MINOR_RQ(type) (IS_DEV_RQ(type) && (type) != DEV_STATUS)