diff --git a/sim/microbit.ts b/sim/microbit.ts
index 34174876..94d1a73a 100644
--- a/sim/microbit.ts
+++ b/sim/microbit.ts
@@ -86,8 +86,6 @@ namespace pxsim.visuals {
         runtime: pxsim.Runtime;
         theme?: IBoardTheme;
         disableTilt?: boolean;
-        activeComponents: string[];
-        fnArgs?: any;
     }
 
     const pointerEvents = !!(window as any).PointerEvent ? {
diff --git a/sim/visuals/boardhost.ts b/sim/visuals/boardhost.ts
index b5eaee3f..9f8cae7b 100644
--- a/sim/visuals/boardhost.ts
+++ b/sim/visuals/boardhost.ts
@@ -21,8 +21,6 @@ namespace pxsim.visuals {
                 this.boardView = new visuals.MicrobitBoardSvg({
                     runtime: runtime,
                     theme: visuals.randomTheme(),
-                    activeComponents: activeComponents,
-                    fnArgs: fnArgs,
                     disableTilt: false
                 });
             } else {