diff --git a/pkgs/development/python-modules/nilearn/default.nix b/pkgs/development/python-modules/nilearn/default.nix
index 41f84dbb6679..c79ea52f558c 100644
--- a/pkgs/development/python-modules/nilearn/default.nix
+++ b/pkgs/development/python-modules/nilearn/default.nix
@@ -12,6 +12,7 @@ buildPythonPackage rec {
 
   checkInputs = [ pytestCheckHook ];
   disabledTests = [ "test_clean_confounds" ];  # https://github.com/nilearn/nilearn/issues/2608
+  pytestFlagsArray = [ "nilearn" ];
 
   propagatedBuildInputs = [
     joblib