diff --git a/CHANGELOG.md b/CHANGELOG.md
index 60473e31..496cb11f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@
 
 * Spanish translations (thanks [rnek0](https://github.com/rnek0)).
 * Hide secret keys in diagnostic tool.
+* Builtin ConverseJS mode: fix advanced controls hiding.
 
 ## v5.0.2
 
diff --git a/conversejs/builtin.ts b/conversejs/builtin.ts
index 3a273644..ccc5ad03 100644
--- a/conversejs/builtin.ts
+++ b/conversejs/builtin.ts
@@ -81,7 +81,7 @@ interface InitConverseParams {
   boshServiceUrl: string
   websocketServiceUrl: string
   authenticationUrl: string
-  advancedControls: 'true' | 'false'
+  advancedControls: boolean
   theme: string
 }
 window.initConverse = async function initConverse ({
diff --git a/conversejs/index.html b/conversejs/index.html
index 61720e8e..3c8c6b97 100644
--- a/conversejs/index.html
+++ b/conversejs/index.html
@@ -21,7 +21,7 @@
     boshServiceUrl: '{{BOSH_SERVICE_URL}}',
     websocketServiceUrl: '{{WS_SERVICE_URL}}',
     authenticationUrl: '{{AUTHENTICATION_URL}}',
-    advancedControls: '{{ADVANCEDCONTROLS}}',
+    advancedControls: '{{ADVANCEDCONTROLS}}' === 'true',
     theme: '{{CONVERSEJS_THEME}}'
   })
 </script>