diff --git a/pkgs/development/python-modules/ics/default.nix b/pkgs/development/python-modules/ics/default.nix
index ed87f3678b15..34a36642976d 100644
--- a/pkgs/development/python-modules/ics/default.nix
+++ b/pkgs/development/python-modules/ics/default.nix
@@ -40,6 +40,8 @@ buildPythonPackage rec {
   disabledTests = [
     # Failure seems to be related to arrow > 1.0
     "test_event"
+    # Broke with TatSu 5.7:
+    "test_many_lines"
   ];
 
   pythonImportsCheck = [ "ics" ];