1 files changed, 5 insertions, 2 deletions

diff --git a/coreutils/sum.c b/coreutils/sum.c
index deb068e10..ec9ed2a11 100644
--- a/coreutils/sum.c
+++ b/coreutils/sum.c
@@ -21,6 +21,7 @@
 //usage:     "\n        -s      Use System V sum algorithm (512byte blocks)"
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 
 enum { SUM_BSD, PRINT_NAME, SUM_SYSV };
 
@@ -30,18 +31,20 @@ enum { SUM_BSD, PRINT_NAME, SUM_SYSV };
 /* Return 1 if successful.  */
 static unsigned sum_file(const char *file, unsigned type)
 {
-#define buf bb_common_bufsiz1
         unsigned long long total_bytes = 0;
         int fd, r;
         /* The sum of all the input bytes, modulo (UINT_MAX + 1).  */
         unsigned s = 0;
 
+#define buf bb_common_bufsiz1
+        setup_common_bufsiz();
+
         fd = open_or_warn_stdin(file);
         if (fd == -1)
                 return 0;
 
         while (1) {
-                size_t bytes_read = safe_read(fd, buf, BUFSIZ);
+                size_t bytes_read = safe_read(fd, buf, COMMON_BUFSIZE);
 
                 if ((ssize_t)bytes_read <= 0) {
                         r = (fd && close(fd) != 0);