diff --git a/src/jugando.ts b/src/jugando.ts
index 1b01730..ce8f4fc 100644
--- a/src/jugando.ts
+++ b/src/jugando.ts
@@ -134,7 +134,7 @@ function socialButtons(juego: Juego<State>): {
   let x = juego.canvas.width - 5;
   let s: any = {};
   for (const network of ["facebook", "instagram", "twitter"]) {
-    const sprite = (juego.sprites as any)[network];
+    const sprite = (juego.sprites as { [key in string]: Sprite })[network];
     const width = sprite.getWidth(juego);
     const height = sprite.getHeight(juego);
     x -= width + 20;