diff --git a/lxc/executors/csharp b/lxc/executors/csharp
index ec47c4a..3124788 100755
--- a/lxc/executors/csharp
+++ b/lxc/executors/csharp
@@ -1,3 +1,3 @@
 cd /tmp/$2
-timeout -s KILL 10 mcs $(echo code.code | sed 's/\///') -out:binary
+timeout -s KILL 10 mcs $(echo code.code | sed 's/\///') -nowarn:0219 -out:binary
 runuser -l runner$1 -c "cd /tmp/$2 ; cat args.args | xargs -d '\n' timeout -s KILL 3 mono binary"