diff --git a/include/patty/list.h b/include/patty/list.h
index ef07b75..97239bf 100644
--- a/include/patty/list.h
+++ b/include/patty/list.h
@@ -12,7 +12,7 @@ typedef struct _patty_list_item {
 } patty_list_item;
 
 typedef struct _patty_list {
-    uint64_t length;
+    size_t length;
 
     patty_list_item *first,
                     *last;