diff --git a/test/csharp/project.json b/test/csharp/project.json
index c578c39baa..ae84d5abc3 100644
--- a/test/csharp/project.json
+++ b/test/csharp/project.json
@@ -5,7 +5,8 @@
     "authors": [ "andschwa" ],
 
     "dependencies": {
-	"Microsoft.PowerShell.Linux.Host": "1.0.0-*"
+	"Microsoft.PowerShell.Linux.Host": "1.0.0-*",
+	"System.IO.Compression": "4.0.1-rc3-23903"
     },
 
     "frameworks": {