diff --git a/pkgs/data/fonts/iosevka/default.nix b/pkgs/data/fonts/iosevka/default.nix
index 10b0a0fd8f0..77946bd4133 100644
--- a/pkgs/data/fonts/iosevka/default.nix
+++ b/pkgs/data/fonts/iosevka/default.nix
@@ -46,7 +46,8 @@ stdenv.mkDerivation rec {
       remarshal -i "$privateBuildPlanJSONPath" -o private-build-plans.toml -if json -of toml
     ''}
     ${lib.optionalString (extraParameters != null) ''
-      remarshal -i "$extraParametersJSONPath" -o parameters.toml -if json -of toml
+      echo -e "\n" >> parameters.toml
+      remarshal -i "$extraParametersJSONPath" -if json -of toml >> parameters.toml
     ''}
     runHook postConfigure
   '';