diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index 4e5a8f4d..cf952e79 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -93,6 +93,7 @@
     <Reference Include="System.Runtime.CompilerServices.Unsafe, Version=4.0.5.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
       <HintPath>..\packages\System.Runtime.CompilerServices.Unsafe.4.6.0\lib\netstandard2.0\System.Runtime.CompilerServices.Unsafe.dll</HintPath>
     </Reference>
+    <Reference Include="System.Runtime.Serialization" />
     <Reference Include="System.Security.Cryptography.Algorithms, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
       <HintPath>..\packages\System.Security.Cryptography.Algorithms.4.3.1\lib\net461\System.Security.Cryptography.Algorithms.dll</HintPath>
     </Reference>