diff --git a/main.c b/main.c
index df8cd21..ae501a3 100644
--- a/main.c
+++ b/main.c
@@ -1060,7 +1060,7 @@ static int move_file(const char *const old, const char *const new)
 
     for (off_t i = 0; i < sb.st_size;)
     {
-        char buf[1024];
+        char buf[BUFSIZ];
         const off_t left = sb.st_size - i;
         const size_t rem = left > sizeof buf ? sizeof buf : left;
         ssize_t w;