diff --git a/lib/config.js b/lib/config.js
index 55e04a0efd7b..3103a26efab8 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -84,6 +84,7 @@ Config.prototype.buildArgs = function () {
     is_debug: this.buildConfig !== 'Release',
     dcheck_always_on: this.buildConfig !== 'Release',
     brave_channel: this.channel,
+    brave_stp_enabled: true,
     google_api_key: this.googleApiKey,
     brave_google_api_key: this.braveGoogleApiKey,
     brave_google_api_endpoint: this.googleApiEndpoint,
diff --git a/package.json b/package.json
index f829f46cbdfd..9d3c8a0a5ad9 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
     "upload": "node ./scripts/commands.js upload",
     "update_patches": "node ./scripts/commands.js update_patches",
     "apply_patches": "node ./scripts/sync.js --run_hooks",
-    "start": "node ./scripts/commands.js start",
+    "start": "node ./scripts/commands.js start --enable-smart-tracking-protection",
     "network-audit": "node ./scripts/commands.js start --enable_brave_update --network_log --user_data_dir_name=brave-network-test",
     "push_l10n": "node ./scripts/commands.js push_l10n",
     "pull_l10n": "node ./scripts/commands.js pull_l10n",