diff --git a/src/dlmalloc_2_8_6.c b/src/dlmalloc_2_8_6.c
index d09464d..9aa1e5a 100644
--- a/src/dlmalloc_2_8_6.c
+++ b/src/dlmalloc_2_8_6.c
@@ -2726,7 +2726,7 @@ static int has_segment_link(mstate m, msegmentptr ss) {
   noncontiguous segments are added.
 */
 #define TOP_FOOT_SIZE\
-  (align_offset(chunk2mem(0))+pad_request(sizeof(struct malloc_segment))+MIN_CHUNK_SIZE)
+  (align_offset(TWO_SIZE_T_SIZES)+pad_request(sizeof(struct malloc_segment))+MIN_CHUNK_SIZE)
 
 
 /* -------------------------------  Hooks -------------------------------- */