diff --git a/1.3/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_Menstruation.cs b/1.3/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_Menstruation.cs
index 067825e..4c4e8b4 100644
--- a/1.3/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_Menstruation.cs
+++ b/1.3/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_Menstruation.cs
@@ -1059,8 +1059,8 @@ namespace RJW_Menstruation
         {
             if (Props.breedingSeason == SeasonalBreed.Always) return true;
             Map map = parent.pawn.Map;
-            if (map is null) map = Find.AnyPlayerHomeMap;
-            if (map is null) return true;
+            if (map == null) map = Find.AnyPlayerHomeMap;
+            if (map == null) return true;
             switch (GenLocalDate.Season(map))
             {
                 case Season.Spring:
@@ -1130,7 +1130,7 @@ namespace RJW_Menstruation
                         egg.fertstage < minImplantAgeHours ||
                         egg.position < Math.Min(Props.lutealIntervalDays / 2, maxImplantDelayDays) * 24)
                         continue;
-                    else if (egg.fertilizer is null)
+                    else if (egg.fertilizer == null)
                     {
                         deadeggs.Add(egg);
                         continue;
diff --git a/1.3/source/RJW_Menstruation/RJW_Menstruation/Patch/RJW_Patch.cs b/1.3/source/RJW_Menstruation/RJW_Menstruation/Patch/RJW_Patch.cs
index 887f6b8..d8dafdb 100644
--- a/1.3/source/RJW_Menstruation/RJW_Menstruation/Patch/RJW_Patch.cs
+++ b/1.3/source/RJW_Menstruation/RJW_Menstruation/Patch/RJW_Patch.cs
@@ -30,7 +30,7 @@ namespace RJW_Menstruation
             var pawnparts = Genital_Helper.get_PartsHediffList(pawn, Genital_Helper.get_genitalsBPR(pawn));
 
             HediffComp_Menstruation comp = partner.GetMenstruationComp();
-            if (comp is null) return true;
+            if (comp == null) return true;
 
             if (Genital_Helper.has_penis_fertile(pawn, pawnparts) && PregnancyHelper.CanImpregnate(pawn, partner, sextype))
             {
@@ -237,7 +237,7 @@ namespace RJW_Menstruation
             foreach(CodeInstruction instruction in instructions)
             {
                 // Get where the compiler decided to index the pawn at
-                if (pawn_index is null && instruction.opcode == OpCodes.Stloc_S)    // the first stloc.s in the IL is the pawn being loaded out of the list
+                if (pawn_index == null && instruction.opcode == OpCodes.Stloc_S)    // the first stloc.s in the IL is the pawn being loaded out of the list
                 {                                                                   // a future RJW or compiler update might change this, or maybe another mod's patch
                     pawn_index = (LocalBuilder)instruction.operand;
                     yield return instruction;