diff --git a/minix/lib/libddekit/src/usb_server.c b/minix/lib/libddekit/src/usb_server.c
index df200435c..1ef3451b5 100644
--- a/minix/lib/libddekit/src/usb_server.c
+++ b/minix/lib/libddekit/src/usb_server.c
@@ -329,7 +329,7 @@ static void submit_urb(message *msg)
 		
 		DEBUG_MSG("URB type: %d", mx_urb->type);
 		/* check if urb is valid */
-		if (mx_urb->dev_id >= MAX_DEVS && mx_urb->dev_id < 0) {
+		if (mx_urb->dev_id >= MAX_DEVS || mx_urb->dev_id < 0) {
 			DEBUG_MSG("Bogus device ID.");
 			res = EINVAL;
 			goto out;