diff --git a/src/economy.cpp b/src/economy.cpp
--- a/src/economy.cpp
+++ b/src/economy.cpp
@@ -1856,7 +1856,7 @@ extern int GetAmountOwnedBy(const Compan
  * @param p1 company to buy the shares from
  * @param p2 unused
  */
-CommandCost CmdBuyShareInCompany(TileIndex tile, uint32 flags, uint32 p1, uint32 p2, const char *text)
+CommandCost CmdBuyShareInCompany(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
 {
 	CommandCost cost(EXPENSES_OTHER);
 
@@ -1901,7 +1901,7 @@ CommandCost CmdBuyShareInCompany(TileInd
  * @param p1 company to sell the shares from
  * @param p2 unused
  */
-CommandCost CmdSellShareInCompany(TileIndex tile, uint32 flags, uint32 p1, uint32 p2, const char *text)
+CommandCost CmdSellShareInCompany(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
 {
 	/* Check if selling shares is allowed (protection against modified clients) */
 	/* Cannot sell own shares */
@@ -1934,7 +1934,7 @@ CommandCost CmdSellShareInCompany(TileIn
  * @param p1 company to buy up
  * @param p2 unused
  */
-CommandCost CmdBuyCompany(TileIndex tile, uint32 flags, uint32 p1, uint32 p2, const char *text)
+CommandCost CmdBuyCompany(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
 {
 	CompanyID cid = (CompanyID)p1;