diff --git a/core.h b/core.h
index e5315b0..1dbf644 100644
--- a/core.h
+++ b/core.h
@@ -158,6 +158,8 @@ DefineList(void, Void);
 #define PushListZero(arena, type, size) (type){ .data=pushSizeFill(arena, ListElementSize(type)*(size), 0), .length=0, .capacity=(size) }
 #define PushFullList(arena, type, size) (type){ .data=pushSize(arena, ListElementSize(type)*size), .length=(size), .capacity=(size) }
 #define PushFullListZero(arena, type, size) (type){ .data=pushSizeFill(arena, ListElementSize(type)*(size), 0), .length=(size), .capacity=(size) }
+void *__listcopyhelper__;
+#define PushListCopy(arena, type, source) (__listcopyhelper__ = pushSize(arena, ListElementSize(type)*(source).length), memcpy(__listcopyhelper__, (source).data, sizeof((source).data[0])*(source).length), (type){ .data=__listcopyhelper__, .length=(source).length, .capacity=(source).length })
 
 #define EmptyList() { NULL, 0, 0 }
 #define __ArrayAsList(array) { .data=(array), .length=ArrayCount(array), .capacity=ArrayCount(array) }
@@ -183,13 +185,13 @@ inline VoidList __cloneList(Arena *arena, VoidList list, size_t underlyingSize)
         .length=list.length,
     };
 }
-#define CloneList(arena, type, list) (type)cloneList((arena), (VoidList)(list), (MemberSizeUnderlying(list)))
+#define CloneList(arena, type, list) (type)cloneList((arena), (VoidList)(list), (sizeof((list).data[0]))
 #define ListAppendList(appendee, list)\
     if ((appendee).capacity - (appendee).length >= list.length) {\
-        memcpy((appendee).data + (appendee).length, (list).data, MemberSizeUnderlying(list)*(list).length);\
+        memcpy((appendee).data + (appendee).length, (list).data, sizeof((list).data[0])*(list).length);\
         (appendee).length += (list).length;\
     }
-    
+
 
 // Following two macros do not use pointers due to copying
 #define ListSlice(list, start, stop) {\