diff --git a/1.4/source/RJW_Menstruation/RJW_Menstruation/Patch/Biotech_Patch.cs b/1.4/source/RJW_Menstruation/RJW_Menstruation/Patch/Biotech_Patch.cs
index eb8777a..0f8f2b6 100644
--- a/1.4/source/RJW_Menstruation/RJW_Menstruation/Patch/Biotech_Patch.cs
+++ b/1.4/source/RJW_Menstruation/RJW_Menstruation/Patch/Biotech_Patch.cs
@@ -195,8 +195,9 @@ namespace RJW_Menstruation
     [HarmonyPatch(typeof(Pawn_GeneTracker), "Notify_GenesChanged")]
     public class Notify_GenesChanged_Patch
     {
-        public static void Postfix(Pawn_GeneTracker __instance)
+        public static void Postfix(Pawn_GeneTracker __instance, GeneDef addedOrRemovedGene)
         {
+            if (!addedOrRemovedGene.HasModExtension<MenstruationModExtension>()) return;
             foreach (HediffComp_Menstruation comp in __instance.pawn.GetMenstruationComps())
                 comp.Notify_UpdatedGenes();
         }