diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
index b1c11775839c..9b5915ebeb35 100644
--- a/drivers/firewire/core-cdev.c
+++ b/drivers/firewire/core-cdev.c
@@ -1583,7 +1583,7 @@ static int dispatch_ioctl(struct client *client,
 	if (_IOC_TYPE(cmd) != '#' ||
 	    _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers) ||
 	    _IOC_SIZE(cmd) > sizeof(buffer))
-		return -EINVAL;
+		return -ENOTTY;
 
 	if (_IOC_DIR(cmd) == _IOC_READ)
 		memset(&buffer, 0, _IOC_SIZE(cmd));