diff --git a/gluon.d.ts b/gluon.d.ts
index 3a8c8e3..18d5258 100644
--- a/gluon.d.ts
+++ b/gluon.d.ts
@@ -76,7 +76,7 @@ type IdleApi = {
   /** Enable/disable automatic idle management, and set its options. */
   auto(
     /** Whether to use automatic idle management. */
-    enabled: bool,
+    enabled: Boolean,
 
     /** Set options for automatic behavior. */
     options?: IdleAutoOptions