diff --git a/pkgs/development/python-modules/tls-parser/default.nix b/pkgs/development/python-modules/tls-parser/default.nix
index fa983be1b6f..ad35fe50128 100644
--- a/pkgs/development/python-modules/tls-parser/default.nix
+++ b/pkgs/development/python-modules/tls-parser/default.nix
@@ -1,5 +1,5 @@
 { lib
-, isPy27
+, pythonOlder
 , fetchFromGitHub
 , buildPythonPackage
 , pytestCheckHook
@@ -8,7 +8,7 @@
 buildPythonPackage rec {
   pname = "tls-parser";
   version = "1.2.2";
-  disabled = isPy27;
+  disabled = pythonOlder "3.7";
 
   src = fetchFromGitHub {
     owner = "nabla-c0d3";