1 files changed, 1 insertions, 1 deletions

diff --git a/editors/diff.c b/editors/diff.c
index e977f4d14..745ef0a33 100644
--- a/editors/diff.c
+++ b/editors/diff.c
@@ -749,7 +749,7 @@ static int asciifile(FILE *f)
         rewind(f);
         cnt = fread(g_read_buf, 1, COMMON_BUFSIZE, f);
         for (i = 0; i < cnt; i++) {
-                if (!isprint(g_read_buf[i])
+                if (!isprint_asciionly(g_read_buf[i])
                  && !isspace(g_read_buf[i])
                 ) {
                         return 0;