diff --git a/fuzzing/fuzz.sh b/fuzzing/fuzz.sh
index 47af7553..e9f28c39 100755
--- a/fuzzing/fuzz.sh
+++ b/fuzzing/fuzz.sh
@@ -6,4 +6,4 @@ export CXX='clang++'
 export CXXFLAGS='-fsanitize-coverage=trace-pc-guard -fsanitize=address'
 export LIB_FUZZING_ENGINE=-lFuzzer
 make OUT=.
-./json_fuzzer my_corpus seed_corpus
+./json_fuzzer my_corpus seed_corpus -max_len=1024 -timeout=10
diff --git a/fuzzing/fuzzer.cpp b/fuzzing/fuzzer.cpp
index acc8a6a2..24b2f191 100644
--- a/fuzzing/fuzzer.cpp
+++ b/fuzzing/fuzzer.cpp
@@ -18,6 +18,9 @@ class memstream : public std::istream {
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   DynamicJsonBuffer jsonBuffer;
   memstream json(data, size);
-  jsonBuffer.parse(json);
+  JsonVariant variant = jsonBuffer.parse(json);
+  if (variant.success()) {
+    variant.as<std::string>();  // <- serialize to JSON
+  }
   return 0;
 }