diff --git a/src/allocator.cpp b/src/allocator.cpp
index cb80c99..c41ed4e 100644
--- a/src/allocator.cpp
+++ b/src/allocator.cpp
@@ -9,25 +9,6 @@ namespace emilua {
 
 namespace interprocess = boost::interprocess;
 
-static inline
-void* do_std_alloc(void* ptr, std::size_t osize, std::size_t nsize)
-{
-    if (nsize == 0) {
-        // free_sized only appeared in C23
-        free(ptr);
-        return nullptr;
-    } else {
-        // even in C23, we don't have realloc_sized() to pass osize along
-        auto ret = realloc(ptr, nsize);
-        if (nsize <= osize) {
-            // According to Programming in Lua 3rd edition § 32.1 ¶ 8, Lua is
-            // unable to recover from allocation shrinking failures.
-            assert(ret);
-        }
-        return ret;
-    }
-}
-
 general_purpose_allocator::general_purpose_allocator(
     std::shared_ptr<void> block, std::size_t block_size)
     : block{std::move(block)}
@@ -50,17 +31,8 @@ lua_Alloc general_purpose_allocator::get_lua_allocator()
             ptr, osize, nsize);
     };
 
-    static constexpr auto use_c_allocator = [](
-        void* /*ud*/, void* ptr, std::size_t osize, std::size_t nsize
-    ) -> void* {
-        return do_std_alloc(ptr, osize, nsize);
-    };
-
-    if (allocator) {
-        return use_boost_allocator;
-    } else {
-        return use_c_allocator;
-    }
+    assert(allocator);
+    return use_boost_allocator;
 }
 
 void general_purpose_allocator::allow_reserved_zone()
diff --git a/src/core.cpp b/src/core.cpp
index 8cb4365..fb63706 100644
--- a/src/core.cpp
+++ b/src/core.cpp
@@ -183,7 +183,9 @@ vm_context::vm_context(
     , lua_errmem(false)
     , exit_request(false)
     , alloc{memory_resource, memory_resource_size}
-    , L_(lua_newstate(alloc.get_lua_allocator(), &alloc))
+    , L_(memory_resource
+         ? lua_newstate(alloc.get_lua_allocator(), &alloc)
+         : luaL_newstate())
     , current_fiber_(nullptr)
 {
     if (!L_)