diff --git a/shell.nix b/shell.nix
index c2a96f2..0a5177f 100644
--- a/shell.nix
+++ b/shell.nix
@@ -49,7 +49,7 @@ let
 
     postHook = ''
       checkPhase() {
-          ( cd "${builtins.toString ./.}/ofborg" && cargo test --lib )
+          ( cd "${builtins.toString ./.}/ofborg" && cargo test --lib -vvvvvvv )
       }
     '';