diff --git a/d2js/js/src/index.d.ts b/d2js/js/src/index.d.ts
index 175baea13..5ef15a5af 100644
--- a/d2js/js/src/index.d.ts
+++ b/d2js/js/src/index.d.ts
@@ -16,7 +16,7 @@ declare module "@terrastruct/d2" {
      * @default 0
      * Set the diagram theme ID.
      */
-    themeId?: number;
+    themeID?: number;
 
     /**
      * @default -1