diff --git a/runtime/utf.cc b/runtime/utf.cc
index 735815d..05b847b 100644
--- a/runtime/utf.cc
+++ b/runtime/utf.cc
@@ -85,10 +85,10 @@
   return static_cast<int32_t>(hash);
 }
 
-int32_t ComputeUtf8Hash(const char* chars) {
-  uint32_t hash = 0;
+size_t ComputeModifiedUtf8Hash(const char* chars) {
+  size_t hash = 0;
   while (*chars != '\0') {
-    hash = hash * 31 + GetUtf16FromUtf8(&chars);
+    hash = hash * 31 + *chars++;
   }
   return static_cast<int32_t>(hash);
 }