diff --git a/tools/checkout-deps.sh b/tools/checkout-deps.sh
index 4addb1090..b6292d2ff 100755
--- a/tools/checkout-deps.sh
+++ b/tools/checkout-deps.sh
@@ -75,7 +75,7 @@ repo="https://github.com/alliedmodders/metamod-source"
 origin=
 checkout
 
-sdks=( csgo hl2dm nucleardawn l4d2 dods l4d css tf2 insurgency sdk2013 dota )
+sdks=( csgo hl2dm nucleardawn l4d2 dods l4d css tf2 insurgency sdk2013 doi )
 
 if [ $ismac -eq 0 ]; then
   # Add these SDKs for Windows or Linux