diff --git a/src/autoslope.h b/src/autoslope.h
--- a/src/autoslope.h
+++ b/src/autoslope.h
@@ -32,14 +32,14 @@ static inline bool AutoslopeCheckForEntr
 /**
  * Tests if autoslope is enabled for _current_company.
  *
- * Autoslope is disabled for town/industry construction and old ai companies.
+ * Autoslope is disabled for town/industry construction.
  *
  * @return true iff autoslope is enabled.
  */
 static inline bool AutoslopeEnabled()
 {
 	return (_settings_game.construction.autoslope &&
-	        ((_current_company < MAX_COMPANIES && !_is_old_ai_company) ||
+	        (_current_company < MAX_COMPANIES ||
 	         (_current_company == OWNER_NONE && _game_mode == GM_EDITOR)));
 }