diff --git a/src/EditorFeatures/TestUtilities/Roslyn.Services.Test.Utilities.csproj b/src/EditorFeatures/TestUtilities/Roslyn.Services.Test.Utilities.csproj
index 64bddc60d32ae91cffbf3a91cf2420a54fbad5d0..6252789e677f7b9eddba418f3bf9e93aeb5f5d6a 100644
--- a/src/EditorFeatures/TestUtilities/Roslyn.Services.Test.Utilities.csproj
+++ b/src/EditorFeatures/TestUtilities/Roslyn.Services.Test.Utilities.csproj
@@ -68,6 +68,7 @@
     <PackageReference Include="Microsoft.VisualStudio.Threading" Version="$(MicrosoftVisualStudioThreadingVersion)" />
     <PackageReference Include="Microsoft.VisualStudio.Utilities" Version="$(MicrosoftVisualStudioUtilitiesVersion)" />
     <PackageReference Include="Microsoft.VisualStudio.Validation" Version="$(MicrosoftVisualStudioValidationVersion)" />
+    <PackageReference Include="System.Threading.Tasks.Dataflow" Version="$(SystemThreadingTasksDataflowVersion)" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="..\..\VisualStudio\Core\Def\Implementation\Remote\JsonRpcClient.cs">