diff --git a/polygerrit-ui/app/wct.conf.js b/polygerrit-ui/app/wct.conf.js
index 0e53adb..1a9300e 100644
--- a/polygerrit-ui/app/wct.conf.js
+++ b/polygerrit-ui/app/wct.conf.js
@@ -27,7 +27,7 @@
 */
 
 const headless = 'WCT_HEADLESS_MODE' in process.env ?
-  process.env['WCT_HEADLESS_MODE'] !== '0' : false;
+  process.env['WCT_HEADLESS_MODE'] === '1' : false;
 
 const headlessBrowserOptions = {
   chrome: ['start-maximized', 'headless', 'disable-gpu', 'no-sandbox'],