diff --git a/depot.h b/depot.h
--- a/depot.h
+++ b/depot.h
@@ -35,11 +35,6 @@ static inline uint16 GetDepotPoolSize(vo
 	return _depot_pool.total_items;
 }
 
-static inline bool IsDepotIndex(uint index)
-{
-	return index < GetDepotPoolSize();
-}
-
 /**
  * Check if a depot really exists.
  */
@@ -48,6 +43,11 @@ static inline bool IsValidDepot(const De
 	return depot->xy != 0;
 }
 
+static inline bool IsValidDepotID(uint index)
+{
+	return index < GetDepotPoolSize() && IsValidDepot(GetDepot(index));
+}
+
 #define FOR_ALL_DEPOTS_FROM(d, start) for (d = GetDepot(start); d != NULL; d = (d->index + 1 < GetDepotPoolSize()) ? GetDepot(d->index + 1) : NULL) if (IsValidDepot(d))
 #define FOR_ALL_DEPOTS(d) FOR_ALL_DEPOTS_FROM(d, 0)