diff --git a/hactoolnet/Program.cs b/hactoolnet/Program.cs
index 9f9b0661..c90d50ae 100644
--- a/hactoolnet/Program.cs
+++ b/hactoolnet/Program.cs
@@ -425,7 +425,6 @@ namespace hactoolnet
             using (var file = new FileStream(ctx.Options.InFile, FileMode.Open, FileAccess.Read))
             {
                 var save = new Savefile(file, ctx.Logger);
-                var layout = save.Header.Layout;
 
                 if (ctx.Options.OutDir != null)
                 {
diff --git a/libhac/Bktr.cs b/libhac/Bktr.cs
index 442cb35a..2dd722e0 100644
--- a/libhac/Bktr.cs
+++ b/libhac/Bktr.cs
@@ -20,9 +20,9 @@ namespace libhac
         public Bktr(Stream patchRomfs, Stream baseRomfs, NcaSection section)
         {
             if (section.Type != SectionType.Bktr) throw new ArgumentException("Section is not of type BKTR");
+            Patch = patchRomfs ?? throw new NullReferenceException($"{nameof(patchRomfs)} cannot be null");
+            Base = baseRomfs ?? throw new NullReferenceException($"{nameof(baseRomfs)} cannot be null");
 
-            Patch = patchRomfs;
-            Base = baseRomfs;
             IvfcLevelHeader level5 = section.Header.Bktr.IvfcHeader.LevelHeaders[5];
             Length = level5.LogicalOffset + level5.HashDataSize;
 
diff --git a/libhac/Ticket.cs b/libhac/Ticket.cs
index adc54f7b..125b1c73 100644
--- a/libhac/Ticket.cs
+++ b/libhac/Ticket.cs
@@ -1,8 +1,5 @@
 using System;
-using System.Collections.Generic;
 using System.IO;
-using System.Linq;
-using System.Text;
 
 namespace libhac
 {