diff --git a/src/Microsoft.AspNet.Diagnostics.Entity/project.json b/src/Microsoft.AspNet.Diagnostics.Entity/project.json
index f96f3ba9b8..92e4fccd44 100644
--- a/src/Microsoft.AspNet.Diagnostics.Entity/project.json
+++ b/src/Microsoft.AspNet.Diagnostics.Entity/project.json
@@ -12,7 +12,8 @@
     "frameworks": {
         "dnx451": {
             "frameworkAssemblies": {
-                "System.Configuration": ""
+                "System.Configuration": "",
+                "System.Threading.Tasks": ""
             }
         },
         "dnxcore50": {