diff --git a/test/addons/worker-buffer-callback/binding.cc b/test/addons/worker-buffer-callback/binding.cc
index 1141c8a051e077..3b0ecf82f02ccb 100644
--- a/test/addons/worker-buffer-callback/binding.cc
+++ b/test/addons/worker-buffer-callback/binding.cc
@@ -28,7 +28,7 @@ void Initialize(Local<Object> exports,
                node::Buffer::New(
                    isolate,
                    data,
-                   sizeof(data),
+                   sizeof(char),
                    [](char* data, void* hint) {
                      free_call_count++;
                    },
diff --git a/test/node-api/test_worker_buffer_callback/test_worker_buffer_callback.c b/test/node-api/test_worker_buffer_callback/test_worker_buffer_callback.c
index b911fd86380644..b327feaeb28878 100644
--- a/test/node-api/test_worker_buffer_callback/test_worker_buffer_callback.c
+++ b/test/node-api/test_worker_buffer_callback/test_worker_buffer_callback.c
@@ -32,7 +32,7 @@ NAPI_MODULE_INIT() {
   NAPI_CALL(env, napi_create_external_arraybuffer(
       env,
       data,
-      sizeof(data),
+      sizeof(char),
       finalize_cb,
       NULL,
       &buffer));