diff --git a/src/__stl__.h b/src/__stl__.h
index 8ac76e5a..e4bbc669 100644
--- a/src/__stl__.h
+++ b/src/__stl__.h
@@ -19,6 +19,7 @@
 #include <string_view>
 #include <queue>
 #include <iomanip>
+#include <memory>
 
 #include <atomic>
 #include <iostream>
diff --git a/src/compiler.h b/src/compiler.h
index e979b103..b4b496bb 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -19,7 +19,7 @@ enum StringType { NORMAL_STRING, RAW_STRING, F_STRING };
 
 class Compiler {
 public:
-    pkpy::unique_ptr<Parser> parser;
+    std::unique_ptr<Parser> parser;
     std::stack<_Code> codes;
     bool isCompilingClass = false;
     int lexingCnt = 0;
@@ -37,7 +37,7 @@ public:
 
     Compiler(VM* vm, const char* source, _Str filename, CompileMode mode){
         this->vm = vm;
-        this->parser = pkpy::make_unique<Parser>(
+        this->parser = std::make_unique<Parser>(
             pkpy::make_shared<SourceMetadata>(source, filename, mode)
         );
 
diff --git a/src/memory.h b/src/memory.h
index ac60d778..78ebed61 100644
--- a/src/memory.h
+++ b/src/memory.h
@@ -96,67 +96,4 @@ namespace pkpy{
         new(p+1) T(std::forward<Args>(args)...);
         return shared_ptr<T>(p);
     }
-
-    template <typename T>
-    class unique_ptr {
-        T* ptr;
-
-    public:
-        unique_ptr() : ptr(nullptr) {}
-        unique_ptr(T* ptr) : ptr(ptr) {}
-        unique_ptr(const unique_ptr& other) = delete;
-        unique_ptr(unique_ptr&& other) : ptr(other.ptr) {
-            other.ptr = nullptr;
-        }
-        ~unique_ptr() {
-            delete ptr;
-        }
-
-        bool operator==(const unique_ptr& other) const {
-            return ptr == other.ptr;
-        }
-
-        bool operator!=(const unique_ptr& other) const {
-            return ptr != other.ptr;
-        }
-
-        bool operator==(std::nullptr_t) const {
-            return ptr == nullptr;
-        }
-
-        bool operator!=(std::nullptr_t) const {
-            return ptr != nullptr;
-        }
-
-        unique_ptr& operator=(const unique_ptr& other) = delete;
-
-        unique_ptr& operator=(unique_ptr&& other) {
-            if (this != &other) {
-                delete ptr;
-                ptr = other.ptr;
-                other.ptr = nullptr;
-            }
-            return *this;
-        }
-
-        T& operator*() const {
-            return *ptr;
-        }
-        T* operator->() const {
-            return ptr;
-        }
-        T* get() const {
-            return ptr;
-        }
-
-        void reset(){
-            delete ptr;
-            ptr = nullptr;
-        }
-    };
-
-    template <typename T, typename... Args>
-    unique_ptr<T> make_unique(Args&&... args) {
-        return unique_ptr<T>(new T(std::forward<Args>(args)...));
-    }
 };
\ No newline at end of file
diff --git a/src/vm.h b/src/vm.h
index 4cd9a645..8617e93c 100644
--- a/src/vm.h
+++ b/src/vm.h
@@ -26,7 +26,7 @@ class VM {
     PyVarDict _modules;                             // loaded modules
     emhash8::HashMap<_Str, _Str> _lazy_modules;     // lazy loaded modules
 protected:
-    std::deque< pkpy::unique_ptr<Frame> > callstack;
+    std::deque< std::unique_ptr<Frame> > callstack;
     PyVar __py2py_call_signal;
     
     inline void test_stop_flag(){
@@ -580,7 +580,7 @@ public:
             throw RuntimeError("RecursionError", "maximum recursion depth exceeded", _cleanErrorAndGetSnapshots());
         }
         Frame* frame = new Frame(code, _module, std::move(locals));
-        callstack.emplace_back(pkpy::unique_ptr<Frame>(frame));
+        callstack.emplace_back(std::unique_ptr<Frame>(frame));
         return frame;
     }