diff --git a/pkgs/os-specific/linux/acpid/default.nix b/pkgs/os-specific/linux/acpid/default.nix
index f5a0cb25c803..ad763d2ee298 100644
--- a/pkgs/os-specific/linux/acpid/default.nix
+++ b/pkgs/os-specific/linux/acpid/default.nix
@@ -10,6 +10,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ autoreconfHook ];
 
+  # remove when https://sourceforge.net/p/acpid2/code/merge-requests/1/ is merged
   postPatch = ''
     substituteInPlace configure.ac \
       --replace "AC_FUNC_MALLOC" "" \