diff --git a/Compression.BSA/BA2Builder.cs b/Compression.BSA/BA2Builder.cs
index 2e366a80..f9a2e346 100644
--- a/Compression.BSA/BA2Builder.cs
+++ b/Compression.BSA/BA2Builder.cs
@@ -8,6 +8,7 @@ using System.Threading.Tasks;
 using ICSharpCode.SharpZipLib.Zip.Compression;
 using ICSharpCode.SharpZipLib.Zip.Compression.Streams;
 using Wabbajack.Common;
+#nullable disable
 
 namespace Compression.BSA
 {
diff --git a/Compression.BSA/BA2Reader.cs b/Compression.BSA/BA2Reader.cs
index 32e5639e..d6c6137b 100644
--- a/Compression.BSA/BA2Reader.cs
+++ b/Compression.BSA/BA2Reader.cs
@@ -8,6 +8,7 @@ using ICSharpCode.SharpZipLib.Zip.Compression;
 using Wabbajack.Common;
 using Wabbajack.Common.Serialization.Json;
 using File = Alphaleonis.Win32.Filesystem.File;
+#nullable disable
 
 namespace Compression.BSA
 {
diff --git a/Compression.BSA/BSA/Builder/BSABuilder.cs b/Compression.BSA/BSA/Builder/BSABuilder.cs
index d04f000b..c4c84eea 100644
--- a/Compression.BSA/BSA/Builder/BSABuilder.cs
+++ b/Compression.BSA/BSA/Builder/BSABuilder.cs
@@ -10,6 +10,7 @@ using K4os.Compression.LZ4.Streams;
 using Wabbajack.Common;
 using File = Alphaleonis.Win32.Filesystem.File;
 using Path = Alphaleonis.Win32.Filesystem.Path;
+#nullable disable
 
 namespace Compression.BSA
 {
diff --git a/Compression.BSA/BSA/Reader/BSAReader.cs b/Compression.BSA/BSA/Reader/BSAReader.cs
index 199ab80d..c1657a24 100644
--- a/Compression.BSA/BSA/Reader/BSAReader.cs
+++ b/Compression.BSA/BSA/Reader/BSAReader.cs
@@ -18,8 +18,8 @@ namespace Compression.BSA
         internal AbsolutePath _fileName;
         internal uint _folderCount;
         internal uint _folderRecordOffset;
-        private Lazy<FolderRecord[]> _folders;
-        internal string _magic;
+        private Lazy<FolderRecord[]> _folders = null!;
+        internal string _magic = string.Empty;
         internal uint _totalFileNameLength;
         internal uint _totalFolderNameLength;
 
diff --git a/Compression.BSA/BSA/Reader/BSAStateObject.cs b/Compression.BSA/BSA/Reader/BSAStateObject.cs
index 0f3783ac..2d1852dc 100644
--- a/Compression.BSA/BSA/Reader/BSAStateObject.cs
+++ b/Compression.BSA/BSA/Reader/BSAStateObject.cs
@@ -10,13 +10,13 @@ namespace Compression.BSA
     [JsonName("BSAState")]
     public class BSAStateObject : ArchiveStateObject
     {
-        public string Magic { get; set; }
+        public string Magic { get; set; } = string.Empty;
         public uint Version { get; set; }
         public uint ArchiveFlags { get; set; }
         public uint FileFlags { get; set; }
 
         public BSAStateObject()
-        { 
+        {
         }
 
         public BSAStateObject(BSAReader bsaReader)
@@ -25,7 +25,6 @@ namespace Compression.BSA
             Version = (uint)bsaReader.HeaderType;
             ArchiveFlags = (uint)bsaReader.ArchiveFlags;
             FileFlags = (uint)bsaReader.FileFlags;
-
         }
 
         public override async Task<IBSABuilder> MakeBuilder(long size)
diff --git a/Compression.BSA/BSA/Reader/FolderRecord.cs b/Compression.BSA/BSA/Reader/FolderRecord.cs
index 00be479c..ce9bb18d 100644
--- a/Compression.BSA/BSA/Reader/FolderRecord.cs
+++ b/Compression.BSA/BSA/Reader/FolderRecord.cs
@@ -13,11 +13,11 @@ namespace Compression.BSA
     {
         internal readonly BSAReader BSA;
         private readonly ReadOnlyMemorySlice<byte> _data;
-        internal Lazy<FileRecord[]> _files;
+        internal Lazy<FileRecord[]> _files = null!;
         private int _prevFileCount;
-        internal FileNameBlock FileNameBlock;
+        internal FileNameBlock FileNameBlock = null!;
         internal int Index { get; }
-        public string Name { get; private set; }
+        public string? Name { get; private set; }
 
         public IEnumerable<IFile> Files => _files.Value;
 
diff --git a/Compression.BSA/Compression.BSA.csproj b/Compression.BSA/Compression.BSA.csproj
index 4c68b680..4517d254 100644
--- a/Compression.BSA/Compression.BSA.csproj
+++ b/Compression.BSA/Compression.BSA.csproj
@@ -6,6 +6,8 @@
       <Platforms>x64</Platforms>
       <RuntimeIdentifier>win10-x64</RuntimeIdentifier>
       <Version>3.0</Version>
+      <Nullable>enable</Nullable>
+      <WarningsAsErrors>nullable</WarningsAsErrors>
       <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
       <AllowedOutputExtensionsInPackageBuildOutputFolder>$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>
     </PropertyGroup>
diff --git a/Compression.BSA/Interfaces/IFolder.cs b/Compression.BSA/Interfaces/IFolder.cs
index a3da1107..0b2794a3 100644
--- a/Compression.BSA/Interfaces/IFolder.cs
+++ b/Compression.BSA/Interfaces/IFolder.cs
@@ -6,7 +6,7 @@ namespace Compression.BSA
 {
     public interface IFolder
     {
-        string Name { get; }
+        string? Name { get; }
         IEnumerable<IFile> Files { get; }
         int FileCount { get; }
     }
diff --git a/Compression.BSA/TES3Reader.cs b/Compression.BSA/TES3Reader.cs
index b57d38cf..0ebe34f6 100644
--- a/Compression.BSA/TES3Reader.cs
+++ b/Compression.BSA/TES3Reader.cs
@@ -5,6 +5,7 @@ using System.Text;
 using System.Threading.Tasks;
 using Wabbajack.Common;
 using Wabbajack.Common.Serialization.Json;
+#nullable disable
 
 namespace Compression.BSA
 {