diff --git a/pkgs/development/python-modules/sipsimple/default.nix b/pkgs/development/python-modules/sipsimple/default.nix
index 63425d2b8bd..29e278c211a 100644
--- a/pkgs/development/python-modules/sipsimple/default.nix
+++ b/pkgs/development/python-modules/sipsimple/default.nix
@@ -25,7 +25,10 @@ buildPythonPackage rec {
   };
 
   preConfigure = ''
+    # TODO: Executable bits are set by upstream with the next release
+    # see AGProjects/python-sipsimple/commit/a36d66cf758afb43c59f7ac48b193c4148eb1848
     chmod +x ./deps/pjsip/configure ./deps/pjsip/aconfigure
+
     export LD=$CC
   '';