diff --git a/FuzzerTracePC.h b/FuzzerTracePC.h
index 1fa9ed1..a937329 100644
--- a/FuzzerTracePC.h
+++ b/FuzzerTracePC.h
@@ -54,7 +54,7 @@
   void Add(const uint8_t *Data, size_t Size) {
     if (Size <= 2) return;
     Size = std::min(Size, Word::GetMaxSize());
-    size_t Idx = SimpleFastHash(Data, Size) % kSize;
+    auto Idx = SimpleFastHash(Data, Size) % kSize;
     MemMemWords[Idx].Set(Data, Size);
   }
   const Word &Get(size_t Idx) {
diff --git a/FuzzerUtil.cpp b/FuzzerUtil.cpp
index 4b161c4..0518549 100644
--- a/FuzzerUtil.cpp
+++ b/FuzzerUtil.cpp
@@ -226,10 +226,11 @@
   return N;
 }
 
-size_t SimpleFastHash(const uint8_t *Data, size_t Size) {
-  size_t Res = 0;
+uint64_t SimpleFastHash(const void *Data, size_t Size, uint64_t Initial) {
+  uint64_t Res = Initial;
+  const uint8_t *Bytes = static_cast<const uint8_t *>(Data);
   for (size_t i = 0; i < Size; i++)
-    Res = Res * 11 + Data[i];
+    Res = Res * 11 + Bytes[i];
   return Res;
 }
 
diff --git a/FuzzerUtil.h b/FuzzerUtil.h
index 2ae5810..a188a7b 100644
--- a/FuzzerUtil.h
+++ b/FuzzerUtil.h
@@ -88,7 +88,7 @@
 
 std::string SearchRegexCmd(const std::string &Regex);
 
-size_t SimpleFastHash(const uint8_t *Data, size_t Size);
+uint64_t SimpleFastHash(const void *Data, size_t Size, uint64_t Initial = 0);
 
 inline size_t Log(size_t X) {
   return static_cast<size_t>((sizeof(unsigned long long) * 8) - Clzll(X) - 1);