diff --git a/src/subsidy.cpp b/src/subsidy.cpp
--- a/src/subsidy.cpp
+++ b/src/subsidy.cpp
@@ -240,7 +240,7 @@ void CreateSubsidy(CargoID cid, SourceTy
  * @param text unused.
  * @return the cost of this operation or an error
  */
-CommandCost CmdCreateSubsidy(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
+CommandCost CmdCreateSubsidy(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const std::string &text)
 {
 	if (!Subsidy::CanAllocateItem()) return CMD_ERROR;