diff --git a/flake.nix b/flake.nix
index 4f4cb40a..aab7537a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -563,7 +563,7 @@
                 nix develop --impure --command poetry run ruff format . --verbose
                 nix develop --impure --command poetry build -vvv
                 nix develop --impure --command poetry run blackbox/ -vvv &
-                nix develop --impure --command sleep 1; i=0; while [ $i -lt 5 ]; do result=$(curl -X 'GET' 'http://0.0.0.0:8000/status' -H 'accept: application/json'); [ "$result" == "True" ] && break || sleep 1; ((i+=1)); done
+                nix develop --impure --command sleep 1; i=0; while [ $i -lt 5 ]; do result=$(curl -X 'GET' 'http://0.0.0.0:8000/status' -H 'accept: application/json'); (([ "$result" == "True" ] && break) || sleep 1; ((i+=1));) done
                 nix develop --impure --command poetry check --lock
               )
               nix flake show --all-systems --json --no-write-lock-file