diff --git a/llvm/lib/Fuzzer/test/TimeoutTest.cpp b/llvm/lib/Fuzzer/test/TimeoutTest.cpp
index d541c05..71790de 100644
--- a/llvm/lib/Fuzzer/test/TimeoutTest.cpp
+++ b/llvm/lib/Fuzzer/test/TimeoutTest.cpp
@@ -6,7 +6,7 @@
 
 static volatile int Sink;
 
-extern "C" void LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
   if (Size > 0 && Data[0] == 'H') {
     Sink = 1;
     if (Size > 1 && Data[1] == 'i') {
@@ -18,5 +18,6 @@
       }
     }
   }
+  return 0;
 }