diff --git a/d2js/js/src/index.d.ts b/d2js/js/src/index.d.ts
index 33b1ef6d2..175baea13 100644
--- a/d2js/js/src/index.d.ts
+++ b/d2js/js/src/index.d.ts
@@ -22,7 +22,7 @@ declare module "@terrastruct/d2" {
      * @default -1
      * The theme to use when the viewer's browser is in dark mode.
      */
-    darkTheme?: number;
+    darkThemeID?: number;
 
     /**
      * @default 100