diff --git a/windmill-worker/nsjail/run.csharp.config.proto b/windmill-worker/nsjail/run.csharp.config.proto
index 389448eff..ee51c1bfb 100644
--- a/windmill-worker/nsjail/run.csharp.config.proto
+++ b/windmill-worker/nsjail/run.csharp.config.proto
@@ -15,16 +15,24 @@ keep_caps: false
 keep_env: true
 mount_proc: true
 
+mount {
+    src: "/nix/store"
+    dst: "/nix/store"
+    is_bind: true
+}
+
 mount {
     src: "/bin"
     dst: "/bin"
     is_bind: true
+    mandatory: false
 }
 
 mount {
     src: "/lib"
     dst: "/lib"
     is_bind: true
+    mandatory: false
 }
 
 
@@ -40,6 +48,7 @@ mount {
     src: "/usr"
     dst: "/usr"
     is_bind: true
+    mandatory: false
 }
 
 mount {