diff --git a/pkgs/tools/backup/bacula/default.nix b/pkgs/tools/backup/bacula/default.nix
index 02b37784eaa9..e5e26169b745 100644
--- a/pkgs/tools/backup/bacula/default.nix
+++ b/pkgs/tools/backup/bacula/default.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
     "--with-logdir=/var/log/bacula"
     "--with-working-dir=/var/lib/bacula"
     "--mandir=\${out}/share/man"
-  ];
+  ] ++ stdenv.lib.optional (stdenv.buildPlatform != stdenv.hostPlatform) "ac_cv_func_setpgrp_void=yes";
 
   installFlags = [
     "logdir=\${out}/logdir"