diff --git a/pkgs/development/python-modules/pgsanity/default.nix b/pkgs/development/python-modules/pgsanity/default.nix
index 7f1c482977a3..df957c92c686 100644
--- a/pkgs/development/python-modules/pgsanity/default.nix
+++ b/pkgs/development/python-modules/pgsanity/default.nix
@@ -20,6 +20,9 @@ buildPythonPackage rec {
     unittestCheckHook
     postgresql
   ];
+
+  unittestFlagsArray = [ "test" ];
+
   propagatedBuildInputs = [ postgresql ];
 
   meta = with lib; {