1 files changed, 3 insertions, 1 deletions

diff --git a/coreutils/sum.c b/coreutils/sum.c
index cc6677221..ec9ed2a11 100644
--- a/coreutils/sum.c
+++ b/coreutils/sum.c
@@ -31,12 +31,14 @@ 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;