diff --git a/src/object_cmd.cpp b/src/object_cmd.cpp
--- a/src/object_cmd.cpp
+++ b/src/object_cmd.cpp
@@ -199,7 +199,7 @@ static CommandCost ClearTile_Object(Tile
  * @param text unused
  * @return the cost of this operation or an error
  */
-CommandCost CmdBuildObject(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
+CommandCost CmdBuildObject(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const std::string &text)
 {
 	CommandCost cost(EXPENSES_PROPERTY);
 
@@ -769,7 +769,7 @@ void GenerateObjects()
 
 				default:
 					uint8 view = RandomRange(spec->views);
-					if (CmdBuildObject(RandomTile(), DC_EXEC | DC_AUTO | DC_NO_TEST_TOWN_RATING | DC_NO_MODIFY_TOWN_RATING, i, view, nullptr).Succeeded()) amount--;
+					if (CmdBuildObject(RandomTile(), DC_EXEC | DC_AUTO | DC_NO_TEST_TOWN_RATING | DC_NO_MODIFY_TOWN_RATING, i, view, {}).Succeeded()) amount--;
 					break;
 			}
 		}