diff --git a/unsloth/models/rl.py b/unsloth/models/rl.py
index 84ab86dd49..4a548f0000 100644
--- a/unsloth/models/rl.py
+++ b/unsloth/models/rl.py
@@ -717,7 +717,7 @@ def _patch_trl_rl_trainers(trainer_file = "grpo_trainer"):
         num_proc_check = \
         "if dataset_num_proc is None:\n"\
         "    from multiprocessing import cpu_count\n"\
-        "    dataset_num_proc = max(cpu_count()+4, 2)\n"
+        "    dataset_num_proc = min(max(cpu_count()+4, 2), 64)\n"
         extra_args += num_proc_check
     pass