diff --git a/src/node_wasi.cc b/src/node_wasi.cc
index 8de7f1fc1cae68..e9bcb42ad6b0d9 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++;
   }
 
@@ -161,6 +163,15 @@ void WASI::New(const FunctionCallbackInfo<Value>& args) {
       free(options.envp[i]);
     delete[] options.envp;
   }
+
+  if (options.preopens != nullptr) {
+    for (uint32_t i = 0; i < options.preopenc; i++) {
+      free(options.preopens[i].mapped_path);
+      free(options.preopens[i].real_path);
+    }
+
+    delete[] options.preopens;
+  }
 }