diff --git a/SafeExamBrowser.Client.UnitTests/SafeExamBrowser.Client.UnitTests.csproj b/SafeExamBrowser.Client.UnitTests/SafeExamBrowser.Client.UnitTests.csproj
index 3de9fdcc..c9b4f870 100644
--- a/SafeExamBrowser.Client.UnitTests/SafeExamBrowser.Client.UnitTests.csproj
+++ b/SafeExamBrowser.Client.UnitTests/SafeExamBrowser.Client.UnitTests.csproj
@@ -82,6 +82,7 @@
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       <HintPath>..\packages\System.Runtime.CompilerServices.Unsafe.6.0.0\lib\net461\System.Runtime.CompilerServices.Unsafe.dll</HintPath>
     </Reference>
+    <Reference Include="System.ServiceModel" />
     <Reference Include="System.Threading.Tasks.Extensions, Version=4.2.0.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
       <HintPath>..\packages\System.Threading.Tasks.Extensions.4.5.4\lib\net461\System.Threading.Tasks.Extensions.dll</HintPath>
     </Reference>
diff --git a/SafeExamBrowser.Runtime.UnitTests/SafeExamBrowser.Runtime.UnitTests.csproj b/SafeExamBrowser.Runtime.UnitTests/SafeExamBrowser.Runtime.UnitTests.csproj
index 135943a6..d077165b 100644
--- a/SafeExamBrowser.Runtime.UnitTests/SafeExamBrowser.Runtime.UnitTests.csproj
+++ b/SafeExamBrowser.Runtime.UnitTests/SafeExamBrowser.Runtime.UnitTests.csproj
@@ -75,6 +75,7 @@
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       <HintPath>..\packages\System.Runtime.CompilerServices.Unsafe.6.0.0\lib\net461\System.Runtime.CompilerServices.Unsafe.dll</HintPath>
     </Reference>
+    <Reference Include="System.ServiceModel" />
     <Reference Include="System.Threading.Tasks.Extensions, Version=4.2.0.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
       <HintPath>..\packages\System.Threading.Tasks.Extensions.4.5.4\lib\net461\System.Threading.Tasks.Extensions.dll</HintPath>
     </Reference>
diff --git a/SafeExamBrowser.Service.UnitTests/SafeExamBrowser.Service.UnitTests.csproj b/SafeExamBrowser.Service.UnitTests/SafeExamBrowser.Service.UnitTests.csproj
index cee973ed..eadd24c7 100644
--- a/SafeExamBrowser.Service.UnitTests/SafeExamBrowser.Service.UnitTests.csproj
+++ b/SafeExamBrowser.Service.UnitTests/SafeExamBrowser.Service.UnitTests.csproj
@@ -76,6 +76,7 @@
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       <HintPath>..\packages\System.Runtime.CompilerServices.Unsafe.6.0.0\lib\net461\System.Runtime.CompilerServices.Unsafe.dll</HintPath>
     </Reference>
+    <Reference Include="System.ServiceModel" />
     <Reference Include="System.Threading.Tasks.Extensions, Version=4.2.0.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
       <HintPath>..\packages\System.Threading.Tasks.Extensions.4.5.4\lib\net461\System.Threading.Tasks.Extensions.dll</HintPath>
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