diff --git a/pkgs/development/python-modules/pytest-celery/default.nix b/pkgs/development/python-modules/pytest-celery/default.nix
index 568159010c9d..0249bc8dbfe8 100644
--- a/pkgs/development/python-modules/pytest-celery/default.nix
+++ b/pkgs/development/python-modules/pytest-celery/default.nix
@@ -42,7 +42,7 @@ buildPythonPackage rec {
 
   build-system = [ poetry-core ];
 
-  buildInput = [ pytest ];
+  buildInputs = [ pytest ];
 
   dependencies = [
     (celery.overridePythonAttrs { doCheck = false; })