diff --git a/src/test.cpp b/src/test.cpp
index f7ddd66..c642cc5 100644
--- a/src/test.cpp
+++ b/src/test.cpp
@@ -314,6 +314,7 @@ TEST_CASE("bench3") {
     auto copy = json;
     parser3::Parser3 parser(&c, nullptr);
     bench.doNotOptimizeAway(parser.parse(copy.data(), copy.length()));
+    bench.doNotOptimizeAway(parser.parse(nullptr, 0) == parser3::S_OK);
   });
 }