diff --git a/microstack/ILibParsers.c b/microstack/ILibParsers.c
index 2d205b4..d3c297c 100644
--- a/microstack/ILibParsers.c
+++ b/microstack/ILibParsers.c
@@ -1278,9 +1278,10 @@ ILibExportMethod void* ILibMemory_GetExtraMemory(void *container, size_t contain
 size_t ILibMemory_GetExtraMemorySize(void* extraMemory)
 {
 	if (extraMemory == NULL) { return 0; }
-	return(((size_t*)((char*)extraMemory - sizeof(size_t)))[0]);
+	return(ILibMemory_Legacy_GetExtraSizePtr(extraMemory)[0]);
 }
 
+
 ILibChain_Link* ILibChain_Link_Allocate(size_t structSize, size_t extraMemorySize)
 {
 	ILibChain_Link *retVal;
diff --git a/microstack/ILibParsers.h b/microstack/ILibParsers.h
index 10ce10c..b7903b9 100644
--- a/microstack/ILibParsers.h
+++ b/microstack/ILibParsers.h
@@ -489,6 +489,10 @@ int ILibIsRunningOnChainThread(void* chain);
 	void* ILibMemory_SmartReAllocate(void *ptr, size_t len);
 	void* ILibMemory_SmartAllocateEx_ResizeExtra(void *ptr, size_t extraSize);
 
+	#define ILibMemory_Legacy_RawSize(containerSize, extraSize) (containerSize + extraSize + sizeof(size_t))
+	#define ILibMemory_Legacy_GetExtraSizePtr(extra) ((size_t*)(((char*)extra)-sizeof(size_t)))
+	#define ILibMemory_Legacy_GetExtraSizePtrEx(container, containerSize) ILibMemory_Legacy_GetExtraSizePtr(ILibMemory_GetExtraMemory(container, containerSize))
+
 	void ILibMemory_SecureZero(void *ptr, size_t len);
 	void ILibMemory_Free(void *ptr);
 	void* ILibMemory_AllocateTemp(void* chain, size_t sz);