diff --git a/llvm/lib/Fuzzer/test/AFLDriverTest.cpp b/llvm/lib/Fuzzer/test/AFLDriverTest.cpp
index 576c538..3dd0b61 100644
--- a/llvm/lib/Fuzzer/test/AFLDriverTest.cpp
+++ b/llvm/lib/Fuzzer/test/AFLDriverTest.cpp
@@ -11,6 +11,12 @@
   return 0;
 }
 
+// This declaration exists to prevent the Darwin linker
+// from complaining about this being a missing weak symbol.
+extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv) {
+  return 0;
+}
+
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
   return 0;
 }