diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index 23742126f47c848b81f38a15af23f30593230354..7c59c28afcc524467f6d1824dccc2442e540c6a6 100644
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -37,7 +37,7 @@ double stddev_stats(struct stats *stats)
 {
 	double variance, variance_mean;
 
-	if (!stats->n)
+	if (stats->n < 2)
 		return 0.0;
 
 	variance = stats->M2 / (stats->n - 1);