diff --git a/pkgs/tools/networking/mailutils/default.nix b/pkgs/tools/networking/mailutils/default.nix
index 6f47b4b5576..c85aaea6f3b 100644
--- a/pkgs/tools/networking/mailutils/default.nix
+++ b/pkgs/tools/networking/mailutils/default.nix
@@ -34,7 +34,7 @@ in stdenv.mkDerivation rec {
   ];
 
   doCheck = true;
-  enableParallelBuilding = true;
+  enableParallelBuilding = false;
   hardeningDisable = [ "format" ];
 
   configureFlags = [