diff --git a/GameData/ROEngines/Waterfall/Hypergolic/AJ10AdvShort.cfg b/GameData/ROEngines/Waterfall/Hypergolic/AJ10AdvShort.cfg
index 54207346..27e2e8fa 100644
--- a/GameData/ROEngines/Waterfall/Hypergolic/AJ10AdvShort.cfg
+++ b/GameData/ROEngines/Waterfall/Hypergolic/AJ10AdvShort.cfg
@@ -22,6 +22,10 @@
 
     @MODULE[ModuleEngineConfigs]:NEEDS[B9PartSwitch]
     {
+        @CONFIG[AJ10-133-Hylas]
+        {
+            %rowaterfallVariant = hydrolox
+        }
         @CONFIG[AJ10-133-LH]
         {
             %rowaterfallVariant = hydrolox