diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp
--- a/src/town_cmd.cpp
+++ b/src/town_cmd.cpp
@@ -3645,7 +3645,7 @@ Town *ClosestTownFromTile(TileIndex tile
 }
 
 static bool _town_rating_test = false; ///< If \c true, town rating is in test-mode.
-static SmallMap<const Town *, int> _town_test_ratings; ///< Map of towns to modified ratings, while in town rating test-mode.
+static std::map<const Town *, int> _town_test_ratings; ///< Map of towns to modified ratings, while in town rating test-mode.
 
 /**
  * Switch the town rating to test-mode, to allow commands to be tested without affecting current ratings.
@@ -3675,8 +3675,8 @@ void SetTownRatingTestMode(bool mode)
 static int GetRating(const Town *t)
 {
 	if (_town_rating_test) {
-		SmallMap<const Town *, int>::iterator it = _town_test_ratings.Find(t);
-		if (it != _town_test_ratings.End()) {
+		auto it = _town_test_ratings.find(t);
+		if (it != _town_test_ratings.end()) {
 			return it->second;
 		}
 	}