diff --git a/src/OmniSharp.MSBuild/project.json b/src/OmniSharp.MSBuild/project.json
index 62d8eeeda2..9bf49894f6 100644
--- a/src/OmniSharp.MSBuild/project.json
+++ b/src/OmniSharp.MSBuild/project.json
@@ -10,7 +10,8 @@
     "Microsoft.Build": "15.1.319-preview5",
     "Microsoft.Build.Framework": "15.1.319-preview5",
     "Microsoft.Build.Tasks.Core": "15.1.319-preview5",
-    "Microsoft.Build.Utilities.Core": "15.1.319-preview5"
+    "Microsoft.Build.Utilities.Core": "15.1.319-preview5",
+    "System.Threading.Tasks.Dataflow": "4.6.0"
   },
   "frameworks": {
     "net46": {},