diff --git a/bin/ai/compat_0.7.nut b/bin/ai/compat_0.7.nut
--- a/bin/ai/compat_0.7.nut
+++ b/bin/ai/compat_0.7.nut
@@ -319,3 +319,5 @@ AIIndustry.IsCargoAccepted <- function(i
 AIAbstractList <- AIList;
 
 AIList.ChangeItem <- AIList.SetValue;
+
+AIRail.ERR_NONUNIFORM_STATIONS_DISABLED <- 0xFFFF;