diff --git a/perf/perf.js b/perf/perf.js
index a1c463320..c621cd6df 100644
--- a/perf/perf.js
+++ b/perf/perf.js
@@ -331,10 +331,10 @@
   suites.push(
     Benchmark.Suite('indexOf isSorted')
       .add('Lo-Dash', function() {
-        lodash.indexOf(numbers, 9, true);
+        lodash.indexOf(numbers, 19, true);
       })
       .add('Underscore', function() {
-        _.indexOf(numbers, 9, true);
+        _.indexOf(numbers, 19, true);
       })
   );