diff --git a/vitamins/screw.scad b/vitamins/screw.scad
index 66d0ebe..6493dbb 100644
--- a/vitamins/screw.scad
+++ b/vitamins/screw.scad
@@ -23,6 +23,7 @@
 include <../utils/core/core.scad>
 
 use <washer.scad>
+use <nut.scad>
 use <../utils/rounded_cylinder.scad>
 use <../utils/thread.scad>
 include <inserts.scad>