diff --git a/BizHawk.Client.Common/BizHawk.Client.Common.csproj b/BizHawk.Client.Common/BizHawk.Client.Common.csproj
index d76357e815..e311024d7e 100644
--- a/BizHawk.Client.Common/BizHawk.Client.Common.csproj
+++ b/BizHawk.Client.Common/BizHawk.Client.Common.csproj
@@ -22,7 +22,6 @@
 		<!--<Reference Include="System.Xml.Linq" />-->
 	</ItemGroup>
 	<ItemGroup>
-		<!--<PackageReference Include="Ionic.Zip" Version="1.9.1.8" PrivateAssets="All" />--><!-- only used in IonicZipWriter.cs, unused and removed from compilation -->
 		<PackageReference Include="Newtonsoft.Json" Version="12.0.3" PrivateAssets="All" />
 		<Reference Include="NLua"
 			HintPath="$(SolutionDir)output/dll/nlua/NLua.dll"
@@ -37,7 +36,6 @@
 	<ItemGroup>
 		<Compile Include="$(SolutionDir)Version/svnrev.cs" />
 		<Compile Include="$(SolutionDir)Version/VersionInfo.cs" />
-		<Compile Remove="IonicZipWriter.cs" />
 	</ItemGroup>
 	<ItemGroup>
 		<Compile Update="movie/bk2/Bk2Movie.HeaderApi.cs" DependentUpon="Bk2Movie.cs" />
diff --git a/BizHawk.Client.Common/IonicZipWriter.cs b/BizHawk.Client.Common/IonicZipWriter.cs
deleted file mode 100644
index a858be48f1..0000000000
--- a/BizHawk.Client.Common/IonicZipWriter.cs
+++ /dev/null
@@ -1,43 +0,0 @@
-using System;
-using System.IO;
-
-using Ionic.Zip;
-
-namespace BizHawk.Client.Common
-{
-	public class IonicZipWriter : IZipWriter
-	{
-		private readonly int _level;
-		private ZipOutputStream _zipOutputStream;
-
-		public IonicZipWriter(string path, int compressionlevel)
-		{
-			_level = compressionlevel;
-			_zipOutputStream = new ZipOutputStream(path)
-			{
-				EnableZip64 = Zip64Option.Never,
-				CompressionLevel = (Ionic.Zlib.CompressionLevel)_level,
-				CompressionMethod = CompressionMethod.Deflate
-			};
-		}
-
-		public void WriteItem(string name, Action<Stream> callback)
-		{
-			var e = _zipOutputStream.PutNextEntry(name);
-			e.CompressionMethod = _level == 0
-				? CompressionMethod.None
-				: CompressionMethod.Deflate;
-
-			callback(_zipOutputStream); // there is no CloseEntry() call
-		}
-
-		public void Dispose()
-		{
-			if (_zipOutputStream != null)
-			{
-				_zipOutputStream.Dispose();
-				_zipOutputStream = null;
-			}
-		}
-	}
-}