diff --git a/pkgs/applications/audio/jmusicbot/default.nix b/pkgs/applications/audio/jmusicbot/default.nix
index 3bc06abcbff..60df749a142 100644
--- a/pkgs/applications/audio/jmusicbot/default.nix
+++ b/pkgs/applications/audio/jmusicbot/default.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
     cp $src $out/lib/JMusicBot
 
     makeWrapper ${jre}/bin/java $out/bin/JMusicBot \
-      --add-flags "-Xmx1G -Dnogui=true -jar $out/lib/JMusicBot"
+      --add-flags "-Xmx1G -Dnogui=true -Djava.util.concurrent.ForkJoinPool.common.parallelism=1 -jar $out/lib/JMusicBot"
   '';
 
   meta = with lib; {