diff --git a/test/Microsoft.AspNetCore.DataProtection.Test.Shared/project.json b/test/Microsoft.AspNetCore.DataProtection.Test.Shared/project.json
index cab6184cad..eacbd61b43 100644
--- a/test/Microsoft.AspNetCore.DataProtection.Test.Shared/project.json
+++ b/test/Microsoft.AspNetCore.DataProtection.Test.Shared/project.json
@@ -3,6 +3,7 @@
     "dnx451": { },
     "dnxcore50": {
       "dependencies": {
+        "System.Runtime": "4.1.0-*"
       }
     }
   },