capitALization
diff --git a/tools/run_tests/run_microbenchmark.py b/tools/run_tests/run_microbenchmark.py
index 05a1233..4e60cce 100755
--- a/tools/run_tests/run_microbenchmark.py
+++ b/tools/run_tests/run_microbenchmark.py
@@ -134,7 +134,7 @@
link(line, '%s.svg' % fnize(line))
benchmarks.append(
jobset.JobSpec(['perf', 'record', '-o', '%s-perf.data' % fnize(line),
- '-g', '-f', '997',
+ '-g', '-F', '997',
'bins/mutrace/%s' % bm_name,
'--benchmark_filter=^%s$' % line,
'--benchmark_min_time=10']))