diff --git a/pkgs/data/fonts/iosevka/default.nix b/pkgs/data/fonts/iosevka/default.nix
index d6d00227ad63d2..9d8843e75a91ed 100644
--- a/pkgs/data/fonts/iosevka/default.nix
+++ b/pkgs/data/fonts/iosevka/default.nix
@@ -70,13 +70,7 @@ stdenv.mkDerivation {
     runHook postConfigure
   '';
 
-  buildPhase = ''
-    runHook preBuild
-
-    ${if custom then ''make custom set=${set}'' else ''make''}
-
-    runHook postBuild
-  '';
+  makeFlags = lib.optionals custom [ "custom" "set=${set}" ];
 
   installPhase = ''
     runHook preInstall
@@ -88,6 +82,8 @@ stdenv.mkDerivation {
     runHook postInstall
   '';
 
+  enableParallelBuilding = true;
+
   meta = with stdenv.lib; {
     homepage = https://be5invis.github.io/Iosevka/;
     downloadPage = "https://github.com/be5invis/Iosevka/releases";