diff --git a/fuzz/regression_runner.cpp b/fuzz/regression_runner.cpp
index 08aedd1b..3f423bea 100644
--- a/fuzz/regression_runner.cpp
+++ b/fuzz/regression_runner.cpp
@@ -38,7 +38,7 @@ void UnpackPackFuzzerRegressionTest(const std::string& fpath) {
   std::vector<char> bytes(length);
   in.read(bytes.data(), bytes.size());
   BOOST_REQUIRE(in);
-  BOOST_REQUIRE_EQUAL(0, FuzzerTestOneInput(reinterpret_cast<const uint8_t *>(bytes.data()), bytes.size()));
+  BOOST_REQUIRE_EQUAL(0, LLVMFuzzerTestOneInput(reinterpret_cast<const uint8_t *>(bytes.data()), bytes.size()));
 }
 
 boost::unit_test::test_suite* init_unit_test_suite(int /*argc*/, char* /*argv*/[])
diff --git a/fuzz/unpack_pack_fuzzer.cpp b/fuzz/unpack_pack_fuzzer.cpp
index 032db43d..b74f2cb3 100644
--- a/fuzz/unpack_pack_fuzzer.cpp
+++ b/fuzz/unpack_pack_fuzzer.cpp
@@ -1,6 +1,10 @@
 #include <msgpack.hpp>
 
-extern "C" int FuzzerTestOneInput(const uint8_t *data, size_t size) {
+// The function's signature must NOT be changed since other projects rely on it:
+// - libFuzzer
+// - AFL++
+// - Google's oss-fuzz (uses the previous two ones)
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   try {
     // NOTE(derwolfe): by default the limits are set at 2^32-1 length. I'm
     // setting these at far smaller values to avoid OOMs
diff --git a/test/fuzz_unpack_pack_fuzzer_cpp11.cpp b/test/fuzz_unpack_pack_fuzzer_cpp11.cpp
index 6bc89448..69d72fa3 100644
--- a/test/fuzz_unpack_pack_fuzzer_cpp11.cpp
+++ b/test/fuzz_unpack_pack_fuzzer_cpp11.cpp
@@ -5,5 +5,5 @@
 
 BOOST_AUTO_TEST_CASE(works)
 {
-  BOOST_CHECK_EQUAL(0, FuzzerTestOneInput(MSGPACK_NULLPTR, 0));
+  BOOST_CHECK_EQUAL(0, LLVMFuzzerTestOneInput(MSGPACK_NULLPTR, 0));
 }