diff --git a/include/mimalloc-new-delete.h b/include/mimalloc-new-delete.h
index 1c12fad2..7af13032 100644
--- a/include/mimalloc-new-delete.h
+++ b/include/mimalloc-new-delete.h
@@ -22,17 +22,26 @@ terms of the MIT license. A copy of the license can be found in the file
   #include <new>
   #include <mimalloc.h>
 
+  #if defined(_MSC_VER) && defined(_Ret_notnull_) && defined(_Post_writable_byte_size_)
+  // stay consistent with VCRT definitions
+  #define mi_decl_new(n)          mi_decl_nodiscard mi_decl_restrict _Ret_notnull_ _Post_writable_byte_size_(n) 
+  #define mi_decl_new_nothrow(n)  mi_decl_nodiscard mi_decl_restrict _Ret_maybenull_ _Success_(return != NULL) _Post_writable_byte_size_(n)
+  #else
+  #define mi_decl_new(n)          mi_decl_nodiscard mi_decl_restrict
+  #define mi_decl_new_nothrow(n)  mi_decl_nodiscard mi_decl_restrict
+  #endif
+
   void operator delete(void* p) noexcept              { mi_free(p); };
   void operator delete[](void* p) noexcept            { mi_free(p); };
 
   void operator delete  (void* p, const std::nothrow_t&) noexcept { mi_free(p); }
   void operator delete[](void* p, const std::nothrow_t&) noexcept { mi_free(p); }
 
-  void* operator new(std::size_t n) noexcept(false)   { return mi_new(n); }
-  void* operator new[](std::size_t n) noexcept(false) { return mi_new(n); }
+  mi_decl_new(n) void* operator new(std::size_t n) noexcept(false) { return mi_new(n); }
+  mi_decl_new(n) void* operator new[](std::size_t n) noexcept(false) { return mi_new(n); }
 
-  void* operator new  (std::size_t n, const std::nothrow_t& tag) noexcept { (void)(tag); return mi_new_nothrow(n); }
-  void* operator new[](std::size_t n, const std::nothrow_t& tag) noexcept { (void)(tag); return mi_new_nothrow(n); }
+  mi_decl_new_nothrow(n) void* operator new  (std::size_t n, const std::nothrow_t& tag) noexcept { (void)(tag); return mi_new_nothrow(n); }
+  mi_decl_new_nothrow(n) void* operator new[](std::size_t n, const std::nothrow_t& tag) noexcept { (void)(tag); return mi_new_nothrow(n); }
 
   #if (__cplusplus >= 201402L || _MSC_VER >= 1916)
   void operator delete  (void* p, std::size_t n) noexcept { mi_free_size(p,n); };
diff --git a/include/mimalloc.h b/include/mimalloc.h
index 9baf26ef..fd287227 100644
--- a/include/mimalloc.h
+++ b/include/mimalloc.h
@@ -28,8 +28,10 @@ terms of the MIT license. A copy of the license can be found in the file
   #define mi_decl_nodiscard    [[nodiscard]]
 #elif (defined(__GNUC__) && (__GNUC__ >= 4)) || defined(__clang__)  // includes clang, icc, and clang-cl
   #define mi_decl_nodiscard    __attribute__((warn_unused_result))
+#elif defined(_HAS_NODISCARD)  
+  #define mi_decl_nodiscard    _NODISCARD
 #elif (_MSC_VER >= 1700)
-  #define mi_decl_nodiscard    _Check_return_
+  #define mi_decl_nodiscard    _Check_return_  
 #else
   #define mi_decl_nodiscard
 #endif