diff --git a/Duplicati/Library/Backend/Storj/Duplicati.Library.Backend.Storj.csproj b/Duplicati/Library/Backend/Storj/Duplicati.Library.Backend.Storj.csproj
index c5d1d21..730371c 100644
--- a/Duplicati/Library/Backend/Storj/Duplicati.Library.Backend.Storj.csproj
+++ b/Duplicati/Library/Backend/Storj/Duplicati.Library.Backend.Storj.csproj
@@ -66,6 +66,7 @@
     <Reference Include="System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
       <HintPath>..\..\..\..\packages\System.Runtime.CompilerServices.Unsafe.4.5.2\lib\netstandard2.0\System.Runtime.CompilerServices.Unsafe.dll</HintPath>
     </Reference>
+    <Reference Include="netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51" />
     <Reference Include="System.Xml.Linq" />
     <Reference Include="System.Data.DataSetExtensions" />
     <Reference Include="Microsoft.CSharp" />
diff --git a/Duplicati/Library/Backend/TencentCOS/Duplicati.Library.Backend.TencentCOS.csproj b/Duplicati/Library/Backend/TencentCOS/Duplicati.Library.Backend.TencentCOS.csproj
index dff5c39..6cdf4f2 100644
--- a/Duplicati/Library/Backend/TencentCOS/Duplicati.Library.Backend.TencentCOS.csproj
+++ b/Duplicati/Library/Backend/TencentCOS/Duplicati.Library.Backend.TencentCOS.csproj
@@ -38,6 +38,7 @@
     <Reference Include="Newtonsoft.Json, Version=13.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
       <HintPath>..\..\..\..\packages\Newtonsoft.Json.13.0.2\lib\net45\Newtonsoft.Json.dll</HintPath>
     </Reference>
+    <Reference Include="netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51" />
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="System.Xml.Linq" />
diff --git a/Duplicati/Library/Encryption/Duplicati.Library.Encryption.csproj b/Duplicati/Library/Encryption/Duplicati.Library.Encryption.csproj
index 7c7da18..149a204 100644
--- a/Duplicati/Library/Encryption/Duplicati.Library.Encryption.csproj
+++ b/Duplicati/Library/Encryption/Duplicati.Library.Encryption.csproj
@@ -35,6 +35,7 @@
     <Reference Include="SharpAESCrypt, Version=1.3.3.0, Culture=neutral, processorArchitecture=MSIL">
       <HintPath>..\..\..\packages\SharpAESCrypt.exe.1.3.3\lib\netstandard2.0\SharpAESCrypt.exe</HintPath>
     </Reference>
+    <Reference Include="netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51" />
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="System.Xml.Linq" />