diff --git a/1.4/source/RJW_Menstruation/RJW_Menstruation/PregnancyCommon.cs b/1.4/source/RJW_Menstruation/RJW_Menstruation/PregnancyCommon.cs
index 633c8a1..2429736 100644
--- a/1.4/source/RJW_Menstruation/RJW_Menstruation/PregnancyCommon.cs
+++ b/1.4/source/RJW_Menstruation/RJW_Menstruation/PregnancyCommon.cs
@@ -1,5 +1,6 @@
 using RimWorld;
 using rjw;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;