diff --git a/core/memory/arena.cpp b/core/memory/arena.cpp
index 1f5eeda..cdc8757 100644
--- a/core/memory/arena.cpp
+++ b/core/memory/arena.cpp
@@ -1,18 +1,21 @@
 #include "arena.h"
-#include <sys/mman.h>
 #include "Base/Assert.h"
+#ifndef WIN32
+#include <sys/mman.h>
+#endif
 
 Memory::Arena Memory::arena_init() {
     // TODO(GloriousEggroll): Replace malloc with a windows memory mapping API.
 #ifdef WIN32
-    static_cast<uint8_t*>(malloc(sizeof(uint8_t) * MEMORY_CAPACITY));
+    auto data =
+        static_cast<uint8_t*>(malloc(sizeof(uint8_t) * MEMORY_CAPACITY));
 #else
     void* data = mmap(nullptr, MEMORY_CAPACITY, PROT_READ | PROT_WRITE,
                       MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
-#endif
     if (data == MAP_FAILED) {
         return {0, 0, nullptr};  // Return invalid arena on failure
     }
+#endif
     Memory::Arena arena = {
         .capacity = MEMORY_CAPACITY,
         .size = 0,