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-rw-r--r--src/vehicle.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/vehicle.h b/src/vehicle.h
index cb0025a9d..9a14c66f7 100644
--- a/src/vehicle.h
+++ b/src/vehicle.h
@@ -429,6 +429,7 @@ static inline bool IsPlayerBuildableVehicleType(const Vehicle *v)
*/
static inline byte VehTypeToIndex(byte type)
{
+ assert(IsPlayerBuildableVehicleType(type));
return type - VEH_Train;
}