diff --git a/LightlessSync/Utils/PtrGuard.cs b/LightlessSync/Utils/PtrGuard.cs
index 356cd6d..9b52514 100644
--- a/LightlessSync/Utils/PtrGuard.cs
+++ b/LightlessSync/Utils/PtrGuard.cs
@@ -50,7 +50,7 @@ namespace LightlessSync.Utils
         {
             if (addr == 0 || size == 0) return false;
 
-            if (VirtualQuery(addr, out var mbi, (nuint)Marshal.SizeOf<MEMORY_BASIC_INFORMATION>()) == 0)
+            if (VirtualQuery(addr, out var mbi, (nuint)Marshal.SizeOf<MemoryBasicInformation>()) == 0)
                 return false;
 
             const uint Commit = 0x1000;