diff --git a/tools/genboardscfg.py b/tools/genboardscfg.py
index 4ee7aa1..07bf681 100755
--- a/tools/genboardscfg.py
+++ b/tools/genboardscfg.py
@@ -430,7 +430,7 @@
     # Add options here
     parser.add_option('-f', '--force', action="store_true", default=False,
                       help='regenerate the output even if it is new')
-    parser.add_option('-j', '--jobs', type='int', default=cpu_count,
+    parser.add_option('-j', '--jobs', type='int', default=min(cpu_count, 240),
                       help='the number of jobs to run simultaneously')
     parser.add_option('-o', '--output', default=OUTPUT_FILE,
                       help='output file [default=%s]' % OUTPUT_FILE)