diff --git a/_config.yml b/_config.yml
index 2b0307ee5..e6c10d5ca 100644
--- a/_config.yml
+++ b/_config.yml
@@ -159,6 +159,7 @@ pcjs:
     - /modules/pdp11/lib/serial.js
     - /modules/pdp11/lib/pc11.js
     - /modules/pdp11/lib/disk.js
+    - /modules/pdp11/lib/drive.js
     - /modules/pdp11/lib/rk11.js
     - /modules/pdp11/lib/rl11.js
     - /modules/shared/es6/debugger.js