diff --git a/test/Microsoft.AspNet.DataProtection.Test.Shared/project.json b/test/Microsoft.AspNet.DataProtection.Test.Shared/project.json
index 70fcad2714..33e2b1875f 100644
--- a/test/Microsoft.AspNet.DataProtection.Test.Shared/project.json
+++ b/test/Microsoft.AspNet.DataProtection.Test.Shared/project.json
@@ -1,7 +1,11 @@
 {
   "frameworks": {
     "dnx451": { },
-    "dnxcore50": { }
+    "dnxcore50": {
+      "dependencies": {
+        "System.Runtime": "4.0.21-*"
+      }
+    }
   },
   "shared": "**/*.cs"
 }