diff --git a/deps/v8/src/objects/value-serializer.cc b/deps/v8/src/objects/value-serializer.cc
index 4ecf4832989292..246281e4e2b44b 100644
--- a/deps/v8/src/objects/value-serializer.cc
+++ b/deps/v8/src/objects/value-serializer.cc
@@ -1190,7 +1190,8 @@ Maybe<T> ValueDeserializer::ReadZigZag() {
 
 Maybe<double> ValueDeserializer::ReadDouble() {
   // Warning: this uses host endianness.
-  if (position_ > end_ - sizeof(double)) return Nothing<double>();
+  if (sizeof(double) > static_cast<unsigned>(end_ - position_))
+    return Nothing<double>();
   double value;
   base::Memcpy(&value, position_, sizeof(double));
   position_ += sizeof(double);