1 files changed, 1 insertions, 1 deletions
diff --git a/src/google/protobuf/stubs/hash.h b/src/google/protobuf/stubs/hash.h
index be998b29..a997e04b 100644
--- a/src/google/protobuf/stubs/hash.h
+++ b/src/google/protobuf/stubs/hash.h
@@ -348,7 +348,7 @@ struct hash<const char*> {
   inline size_t operator()(const char* str) const {
     size_t result = 0;
     for (; *str != '\0'; str++) {
-      result = 5 * result + *str;
+      result = 5 * result + static_cast<size_t>(*str);
     }
     return result;
   }