diff --git a/core/memory/arena.cpp b/core/memory/arena.cpp
index 8eca6eb..10af440 100644
--- a/core/memory/arena.cpp
+++ b/core/memory/arena.cpp
@@ -7,7 +7,8 @@
 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);