diff --git a/pkgs/development/python-modules/future-fstrings/default.nix b/pkgs/development/python-modules/future-fstrings/default.nix
index 7df148df09c..9e49147315b 100644
--- a/pkgs/development/python-modules/future-fstrings/default.nix
+++ b/pkgs/development/python-modules/future-fstrings/default.nix
@@ -18,5 +18,6 @@ buildPythonPackage rec {
     description = "A backport of fstrings to python<3.6";
     license = licenses.mit;
     maintainers = with maintainers; [ nyanloutre ];
+    broken = pythonOlder "3.6"; # dependency tokenize-rt not packaged
   };
 }