diff --git a/install.ps1 b/install.ps1
index a82b1b70a..1dbafd3ab 100644
--- a/install.ps1
+++ b/install.ps1
@@ -509,7 +509,10 @@ try {
     if (-not (Test-Path -LiteralPath $configJsonPath)) {
         $cfg = @{
             git_path = $stdGitPath
-        } | ConvertTo-Json -Compress
+            feature_flags = @{
+                async_mode = $true
+            }
+        } | ConvertTo-Json -Depth 3 -Compress
         $utf8NoBom = New-Object System.Text.UTF8Encoding($false)
         [System.IO.File]::WriteAllText($configJsonPath, $cfg, $utf8NoBom)
     }
diff --git a/install.sh b/install.sh
index f8fd9c841..413522744 100755
--- a/install.sh
+++ b/install.sh
@@ -357,7 +357,10 @@ if [ ! -f "$CONFIG_JSON_PATH" ]; then
     TMP_CFG="$CONFIG_JSON_PATH.tmp.$$"
     cat >"$TMP_CFG" <<EOF
 {
-  "git_path": "${STD_GIT_PATH}"
+  "git_path": "${STD_GIT_PATH}",
+  "feature_flags": {
+    "async_mode": true
+  }
 }
 EOF
     mv -f "$TMP_CFG" "$CONFIG_JSON_PATH"