diff --git a/mnt/c/strawberry_build/build/perl_core/perl-5.38.2/win32/vmem.h b/vmem.h
index c425ae1..18289c1 100755
--- a/win32/vmem.h
+++ b/win32/vmem.h
@@ -86,6 +86,7 @@ typedef struct _MemoryBlockHeader {
     PMEMORY_BLOCK_HEADER    pNext;
     PMEMORY_BLOCK_HEADER    pPrev;
     VMem *owner;
+    void *reserved;
 
 #if defined(__MINGW64__) && __GNUC__ > 11
 } MEMORY_BLOCK_HEADER __attribute__ ((aligned(16))), *PMEMORY_BLOCK_HEADER;