1 files changed, 1 insertions, 0 deletions

diff --git a/editors/diff.c b/editors/diff.c
index 3c8e9074a..ff269360f 100644
--- a/editors/diff.c
+++ b/editors/diff.c
@@ -749,6 +749,7 @@ static int diffreg(char *file[2])
                 fp[i] = fdopen(fd, "r");
         }
 
+        setup_common_bufsiz();
         while (1) {
                 const size_t sz = COMMON_BUFSIZE / 2;
                 char *const buf0 = bb_common_bufsiz1;