diff --git a/src/game.rs b/src/game.rs
index 875d847..e950f56 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -194,7 +194,9 @@ impl ToString for Game {
         segments.push(self.avatar.to_string());
 
         for sprite in &self.sprites {
-            segments.push(sprite.to_string());
+            if ! is_string_numeric(sprite.id.to_base36()) {
+                segments.push(sprite.to_string());
+            }
         }
 
         for item in &self.items {