diff --git a/src/node_snapshotable.cc b/src/node_snapshotable.cc
index 55a65deeea6e74..32371a69588ce7 100644
--- a/src/node_snapshotable.cc
+++ b/src/node_snapshotable.cc
@@ -1357,9 +1357,11 @@ StartupData SerializeNodeContextInternalFields(Local<Object> holder,
   // To serialize the type field, save data in a EmbedderTypeInfo.
   if (index == BaseObject::kEmbedderType) {
     int size = sizeof(EmbedderTypeInfo);
-    char* data = new char[size];
     // We need to use placement new because V8 calls delete[] on the returned
     // data.
+    // The () syntax at the end would zero-initialize the block and make
+    // the padding reproducible.
+    char* data = new char[size]();
     // TODO(joyeecheung): support cppgc objects.
     new (data) EmbedderTypeInfo(obj->type(),
                                 EmbedderTypeInfo::MemoryMode::kBaseObject);
diff --git a/src/node_snapshotable.h b/src/node_snapshotable.h
index 5e281b8155c810..4ae52d8f3ae747 100644
--- a/src/node_snapshotable.h
+++ b/src/node_snapshotable.h
@@ -47,6 +47,7 @@ struct InternalFieldInfoBase {
                       std::is_same_v<InternalFieldInfoBase, T>,
                   "Can only accept InternalFieldInfoBase subclasses");
     void* buf = ::operator new[](sizeof(T));
+    memset(buf, 0, sizeof(T));  // Make the padding reproducible.
     T* result = new (buf) T;
     result->type = type;
     result->length = sizeof(T);