diff --git a/pxt.json b/pxt.json
index a655cde..68cd70b 100644
--- a/pxt.json
+++ b/pxt.json
@@ -7,7 +7,7 @@
         "radio": "*",
         "microphone": "*",
         "datalogger": "*",
-        "arcadeshield": "github:microsoft/pxt-arcadeshield#v0.0.8",
+        "pxt-arcadeshield": "github:microsoft/pxt-arcadeshield#8b0e31213a5d04e18c758fa83b38d802ace40856",
         "jacdac": "github:microsoft/pxt-jacdac#v1.9.28",
         "jacdac-light-level": "github:microsoft/pxt-jacdac/light-level#v1.9.28",
         "jacdac-soil-moisture": "github:microsoft/pxt-jacdac/tree/master/soil-moisture#v1.9.28",
diff --git a/scene.ts b/scene.ts
index ef4d18c..a9f5392 100644
--- a/scene.ts
+++ b/scene.ts
@@ -93,7 +93,7 @@ namespace microcode {
                 this.draw()
                 if (Options.fps)
                     Screen.image.print(context.EventContext.lastStats, 1, 1, 15)
-                if (screen !== Screen.image)
+                if (screen() !== Screen.image)
                     screen().drawBitmap(Screen.image, 0, 0)
             })
             context.eventContext().registerFrameHandler(SCREEN_PRIORITY, () => {
diff --git a/screen.ts b/screen.ts
index b028c19..6aa2645 100644
--- a/screen.ts
+++ b/screen.ts
@@ -45,13 +45,13 @@
         }
         public static get image(): Bitmap {
             if (!Screen.image_) {
-                Screen.image_ = screen
+                Screen.image_ = screen()
                 Screen.updateBounds()
             }
             return Screen.image_
         }
         public static resetScreenImage() {
-            Screen.image_ = screen
+            Screen.image_ = screen()
             Screen.updateBounds()
         }