diff --git a/pkgs/by-name/ni/ninjabrain-bot/package.nix b/pkgs/by-name/ni/ninjabrain-bot/package.nix
index bb822425ef98..f42129de5cd1 100644
--- a/pkgs/by-name/ni/ninjabrain-bot/package.nix
+++ b/pkgs/by-name/ni/ninjabrain-bot/package.nix
@@ -65,6 +65,7 @@ maven.buildMavenPackage (finalAttrs: {
     makeWrapperArgs=(
       --add-flags "-Dawt.useSystemAAFontSettings=on"
       --add-flags "-Dswing.aatext=true"
+      --add-flags "-Dswing.defaultlaf=javax.swing.plaf.metal.MetalLookAndFeel"
       --add-flags "-jar $out/share/java/ninjabrain-bot.jar"
     )