diff --git a/test/Microsoft.AspNetCore.Mvc.TestCommon/project.json b/test/Microsoft.AspNetCore.Mvc.TestCommon/project.json
index b9fa0d5d1f..a5080ac6ad 100644
--- a/test/Microsoft.AspNetCore.Mvc.TestCommon/project.json
+++ b/test/Microsoft.AspNetCore.Mvc.TestCommon/project.json
@@ -5,6 +5,7 @@
     "dnx451": {},
     "dnxcore50": {
       "dependencies": {
+        "System.Runtime": "4.1.0-*"
       }
     }
   }
diff --git a/test/Microsoft.AspNetCore.Mvc.TestDiagnosticListener.Sources/project.json b/test/Microsoft.AspNetCore.Mvc.TestDiagnosticListener.Sources/project.json
index b9fa0d5d1f..a5080ac6ad 100644
--- a/test/Microsoft.AspNetCore.Mvc.TestDiagnosticListener.Sources/project.json
+++ b/test/Microsoft.AspNetCore.Mvc.TestDiagnosticListener.Sources/project.json
@@ -5,6 +5,7 @@
     "dnx451": {},
     "dnxcore50": {
       "dependencies": {
+        "System.Runtime": "4.1.0-*"
       }
     }
   }
diff --git a/test/WebSites/UserClassLibrary/project.json b/test/WebSites/UserClassLibrary/project.json
index b6ff46b7cb..eee2211a60 100644
--- a/test/WebSites/UserClassLibrary/project.json
+++ b/test/WebSites/UserClassLibrary/project.json
@@ -3,6 +3,7 @@
         "dnx451": { },
         "dnxcore50": {
             "dependencies": {
+                "System.Runtime": "4.1.0-*"
             }
         }
     }