diff --git a/build/scenario/afl.py b/build/scenario/afl.py
index 04c7a2a2e..2ca9165d6 100755
--- a/build/scenario/afl.py
+++ b/build/scenario/afl.py
@@ -1,7 +1,8 @@
 #!/usr/bin/env python
 import subprocess
+import multiprocessing
 
-NUMBER_OF_FUZZERS=8
+NUMBER_OF_FUZZERS=multiprocessing.cpu_count()
 
 def afl_command(name):
   master_option = "-M" if name.startswith("master") else "-S"