diff --git a/test/test_cpu.py b/test/test_cpu.py
index 5860eeebc..43a8a56e7 100644
--- a/test/test_cpu.py
+++ b/test/test_cpu.py
@@ -7,10 +7,11 @@
 import unittest
 import pexpect
 import sys
+import os
 
 class TestCPU(unittest.TestCase):
-    def boot_test(self, cpu_type, cpu_variant="standard"):
-        cmd = f'litex_sim --cpu-type={cpu_type} --cpu-variant={cpu_variant} --opt-level=O0'
+    def boot_test(self, cpu_type, jobs, cpu_variant="standard"):
+        cmd = f'litex_sim --cpu-type={cpu_type} --cpu-variant={cpu_variant} --opt-level=O0 --jobs {jobs}'
         litex_prompt = [b'\033\[[0-9;]+mlitex\033\[[0-9;]+m>']
         is_success = True
         with open("/tmp/test_boot_log", "wb") as result_file:
@@ -65,6 +66,7 @@ class TestCPU(unittest.TestCase):
             "zynq7000",     # (arm     / hardcore) -> Hardcore.
             "zynqmp",       # (aarch64 / hardcore) -> Hardcore.
         ]
+        jobs = os.cpu_count()
         for cpu in tested_cpus:
              with self.subTest(target=cpu):
-                self.assertTrue(self.boot_test(cpu))
+                self.assertTrue(self.boot_test(cpu, jobs))