diff --git a/src/env.cc b/src/env.cc
index ba3e63ad8db7c6..c747a952a340ea 100644
--- a/src/env.cc
+++ b/src/env.cc
@@ -923,6 +923,7 @@ void Environment::BuildEmbedderGraph(Isolate* isolate,
 }
 
 char* Environment::Reallocate(char* data, size_t old_size, size_t size) {
+  if (old_size == size) return data;
   // If we know that the allocator is our ArrayBufferAllocator, we can let
   // if reallocate directly.
   if (isolate_data()->uses_node_allocator()) {