diff --git a/src/node_wasi.cc b/src/node_wasi.cc
index 8de7f1fc1cae68..b3b266f5cfe577 100644
--- a/src/node_wasi.cc
+++ b/src/node_wasi.cc
@@ -134,7 +134,7 @@ void WASI::New(const FunctionCallbackInfo<Value>& args) {
   Local<Array> preopens = args[2].As<Array>();
   CHECK_EQ(preopens->Length() % 2, 0);
   options.preopenc = preopens->Length() / 2;
-  options.preopens = UncheckedCalloc<uvwasi_preopen_t>(options.preopenc);
+  options.preopens = Calloc<uvwasi_preopen_t>(options.preopenc);
   int index = 0;
   for (uint32_t i = 0; i < preopens->Length(); i += 2) {
     auto mapped = preopens->Get(context, i).ToLocalChecked();
@@ -144,7 +144,9 @@ void WASI::New(const FunctionCallbackInfo<Value>& args) {
     node::Utf8Value mapped_path(env->isolate(), mapped);
     node::Utf8Value real_path(env->isolate(), real);
     options.preopens[index].mapped_path = strdup(*mapped_path);
+    CHECK_NOT_NULL(options.preopens[index].mapped_path);
     options.preopens[index].real_path = strdup(*real_path);
+    CHECK_NOT_NULL(options.preopens[index].real_path);
     index++;
   }