diff --git a/bin/ai/compat_1.0.nut b/bin/ai/compat_1.0.nut
--- a/bin/ai/compat_1.0.nut
+++ b/bin/ai/compat_1.0.nut
@@ -70,3 +70,5 @@ AIIndustry.IsCargoAccepted <- function(i
 AIAbstractList <- AIList;
 
 AIList.ChangeItem <- AIList.SetValue;
+
+AIRail.ERR_NONUNIFORM_STATIONS_DISABLED <- 0xFFFF;