diff --git a/pkgs/development/python-modules/hcs-utils/default.nix b/pkgs/development/python-modules/hcs-utils/default.nix
index bd691b42dc73..70b0e4e776e1 100644
--- a/pkgs/development/python-modules/hcs-utils/default.nix
+++ b/pkgs/development/python-modules/hcs-utils/default.nix
@@ -34,6 +34,7 @@ buildPythonPackage {
 
   disabledTests = [
     "test_expand" # It depends on FHS
+    "test_blocking" # flaky, depends on comparing running time w/ magic value
   ];
 
   nativeCheckInputs = [ pytestCheckHook ];