1 files changed, 2 insertions, 0 deletions
diff --git a/src/sprite.h b/src/sprite.h
index 52752619b..64721b740 100644
--- a/src/sprite.h
+++ b/src/sprite.h
@@ -112,6 +112,8 @@ class Sprite
         virtual void *getHash2()
         { return this; }
 
+        virtual bool updateNumber(unsigned num) = 0;
+
     protected:
         float mAlpha;                  /**< The alpha opacity used to draw */
 };