diff --git a/aircraft_cmd.c b/aircraft_cmd.c
index f832b27765..b66d0d6e7f 100644
--- a/aircraft_cmd.c
+++ b/aircraft_cmd.c
@@ -364,7 +364,7 @@ int32 CmdSellAircraft(int x, int y, uint32 flags, uint32 p1, uint32 p2)
 
 	v = GetVehicle(p1);
 
-	if (!CheckOwnership(v->owner) || !CheckStoppedInHangar(v))
+	if (v->type != VEH_Aircraft || !CheckOwnership(v->owner) || !CheckStoppedInHangar(v))
 		return CMD_ERROR;
 
 	if (flags & DC_EXEC) {
diff --git a/ship_cmd.c b/ship_cmd.c
index c85377187a..0bab059ba4 100644
--- a/ship_cmd.c
+++ b/ship_cmd.c
@@ -919,7 +919,7 @@ int32 CmdSellShip(int x, int y, uint32 flags, uint32 p1, uint32 p2)
 
 	v = GetVehicle(p1);
 
-	if (!CheckOwnership(v->owner))
+	if (v->type != VEH_Ship || !CheckOwnership(v->owner))
 		return CMD_ERROR;
 
 	if (!IsShipDepotTile(v->tile) || v->u.road.state != 0x80 || !(v->vehstatus&VS_STOPPED))
diff --git a/train_cmd.c b/train_cmd.c
index 0b632029b6..f5fa01fe8d 100644
--- a/train_cmd.c
+++ b/train_cmd.c
@@ -873,7 +873,7 @@ int32 CmdSellRailWagon(int x, int y, uint32 flags, uint32 p1, uint32 p2)
 
 	v = GetVehicle(p1);
 
-	if (v->type == 0 || !CheckOwnership(v->owner))
+	if (v->type != VEH_Train || !CheckOwnership(v->owner))
 		return CMD_ERROR;
 
 	// get first vehicle in chain