diff --git a/1.5/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_Menstruation.cs b/1.5/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_Menstruation.cs
index 733e865..706525a 100644
--- a/1.5/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_Menstruation.cs
+++ b/1.5/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_Menstruation.cs
@@ -658,7 +658,7 @@ namespace RJW_Menstruation
             opcache = -1;
 
             if (Pawn.genes == null || !ModsConfig.BiotechActive) return;
-            foreach (MenstruationModExtension extension in Pawn.genes.GenesListForReading.Select(gene => gene.def.GetModExtension<MenstruationModExtension>()).Where(ext => ext != null))
+            foreach (MenstruationModExtension extension in Pawn.genes.GenesListForReading.Where(gene => gene.Active).Select(gene => gene.def.GetModExtension<MenstruationModExtension>()).Where(ext => ext != null))
             {
                 eggLifeSpanTicks = (int)(eggLifeSpanTicks * extension.eggLifeTimeFactor);
                 if (extension.alwaysEstrus) estrusLevel = EstrusLevel.Visible;