diff --git a/src/scripts/unix.sh b/src/scripts/unix.sh
index 7ca19e4d..a5abf380 100644
--- a/src/scripts/unix.sh
+++ b/src/scripts/unix.sh
@@ -151,6 +151,7 @@ self_hosted_setup() {
       exit 1
     else
       self_hosted_helper >/dev/null 2>&1
+      add_env RUNNER_TOOL_CACHE /tmp
     fi
   fi
 }
diff --git a/src/scripts/win32.ps1 b/src/scripts/win32.ps1
index c021c893..7dfcbb76 100644
--- a/src/scripts/win32.ps1
+++ b/src/scripts/win32.ps1
@@ -296,6 +296,7 @@ if(-not($env:ImageOS) -and -not($env:ImageVersion)) {
   New-Item $php_dir -Type Directory -Force > $null 2>&1
   Add-Path -PathItem $php_dir
   setx PHPROOT $php_dir >$null 2>&1
+  Add-Env -EnvName RUNNER_TOOL_CACHE -EnvValue $env:TEMP
 } else {
   $current_profile = "$PSHOME\Profile.ps1"
   if(-not(Test-Path -LiteralPath $current_profile)) {