diff --git a/tools/checkout-deps.ps1 b/tools/checkout-deps.ps1
index 9e608ab71b..f2d720aa93 100644
--- a/tools/checkout-deps.ps1
+++ b/tools/checkout-deps.ps1
@@ -92,6 +92,8 @@ $SDKS | ForEach-Object {
     Get-Repository -Name "hl2sdk-$_" -Branch $_ -Repo "hl2sdk-proxy-repo" "https://github.com/alliedmodders/hl2sdk.git"
 }
 
+Get-Repository -Name "hl2sdk-mock" -Branch "master" -Repo "https://github.com/alliedmodders/hl2sdk-mock.git"
+
 # Find a suitable installation of Python
 $PYTHON_CMD = Get-Command 'python3' -ErrorAction SilentlyContinue
 if ($NULL -eq $PYTHON_CMD)
diff --git a/tools/checkout-deps.sh b/tools/checkout-deps.sh
index 42c30996dc..059bd1776d 100755
--- a/tools/checkout-deps.sh
+++ b/tools/checkout-deps.sh
@@ -153,6 +153,12 @@ do
   checkout
 done
 
+name=hl2sdk-mock
+branch=master
+repo="https://github.com/alliedmodders/hl2sdk-mock"
+origin=
+checkout
+
 python_cmd=`command -v python3`
 if [ -z "$python_cmd" ]; then
   python_cmd=`command -v python`