diff --git a/pmc/include/drawable.h b/pmc/include/drawable.h
--- a/pmc/include/drawable.h
+++ b/pmc/include/drawable.h
@@ -16,7 +16,7 @@
 
   public:
     virtual ~ Drawable () {};
-    virtual void move (Vector location) = 0;
+    virtual void move (Vector) = 0;
     virtual void show () = 0;
 };
 #endif