diff --git a/pkgs/servers/mail/postfix/default.nix b/pkgs/servers/mail/postfix/default.nix
index 002ea06ef905..ca8d54d6006d 100644
--- a/pkgs/servers/mail/postfix/default.nix
+++ b/pkgs/servers/mail/postfix/default.nix
@@ -84,6 +84,8 @@ in stdenv.mkDerivation rec {
     make makefiles CCARGS='${ccargs}' AUXLIBS='${auxlibs}'
   '';
 
+  enableParallelBuilding = true;
+
   NIX_LDFLAGS = lib.optionalString withLDAP "-llber";
 
   installTargets = [ "non-interactive-package" ];