diff --git a/net-image/net-image.nix b/net-image/net-image.nix
index 69a0a16..817f51b 100644
--- a/net-image/net-image.nix
+++ b/net-image/net-image.nix
@@ -77,7 +77,7 @@ in
     };
 
     nfsOptions = mkOption {
-      type = listOf types.str;
+      type = with types; listOf str;
       default = [
           "nolock"
           "rw"