diff --git a/repos/mml/src/app/posix_playground/main.cc b/repos/mml/src/app/posix_playground/main.cc
index 6db6c59fec..cf32a81126 100644
--- a/repos/mml/src/app/posix_playground/main.cc
+++ b/repos/mml/src/app/posix_playground/main.cc
@@ -8,6 +8,9 @@
 #include <vector>
 #include <unistd.h>
 #include <iostream>
+#include <sys/mman.h>
+#include <cstring>
+#include <errno.h>
 
 namespace Posix_playground {
     class Chrono_thread;
@@ -44,30 +47,32 @@ int main(void) {
 
     std::cout << "Let's start some threads" << std::endl;
 
-    std::vector<Posix_playground::Chrono_thread*> thread_objs(5);
+    std::unique_ptr<std::vector<Posix_playground::Chrono_thread*>> thread_objs = std::make_unique<std::vector<Posix_playground::Chrono_thread*>>();
     std::vector<std::thread*> thread_list(4);
 
     std::cout << "Let's use aligned memory for threads objects." << std::endl;
 
     for (int i = 0; i < 3; i++) {
-        Posix_playground::Chrono_thread *thread_obj;
-        if(posix_memalign((void**)(&thread_obj), 64, sizeof(Posix_playground::Chrono_thread))) {
+        Posix_playground::Chrono_thread *thread_obj = nullptr;
+        //        std::unique_ptr<Posix_playground::Chrono_thread> thread_obj;
+        if((posix_memalign((void**)&thread_obj, 64, sizeof(Posix_playground::Chrono_thread)))) {
             std::cerr << "Could not allocate thread object " << i << std::endl;
             continue;
         }
         std::cout << "Thread object " << (i + 1) << " is at address " << (void *)(thread_obj) << std::endl;
 
-        thread_objs[i] = new (thread_obj) Posix_playground::Chrono_thread((std::uint16_t)(i+1));
+        thread_objs.get()->emplace_back(new (thread_obj) Posix_playground::Chrono_thread((std::uint16_t)(i+1)));
         
-        auto thread =  new std::thread([thread_objs, i]
-                                      { thread_objs[i]->execute(); });
+        auto thread =  new std::thread([&thread_objs, i]
+                                      { (thread_objs.get()->at(i))->execute(); });
         thread_list[i] = thread;
     }
 
     for (auto thread : thread_list) {
         thread->join();
     }
-    
+
+
     while(true);
 
     return 0;