diff --git a/src/Microsoft.Net.Http.Server/project.json b/src/Microsoft.Net.Http.Server/project.json
index 9cac2b5ca4..f67b5bac6c 100644
--- a/src/Microsoft.Net.Http.Server/project.json
+++ b/src/Microsoft.Net.Http.Server/project.json
@@ -20,6 +20,7 @@
         "System.IO": "4.0.11-*",
         "System.IO.FileSystem": "4.0.1-*",
         "System.Net.Primitives": "4.0.11-*",
+        "System.Runtime.InteropServices": "4.0.21-*",
         "System.Security.Claims": "4.0.1-*",
         "System.Security.Cryptography.X509Certificates": "4.0.0-*",
         "System.Security.Principal.Windows": "4.0.0-*",