1 files changed, 5 insertions, 4 deletions

diff --git a/coreutils/sort.c b/coreutils/sort.c
index 80b578fc2..01b7c44e5 100644
--- a/coreutils/sort.c
+++ b/coreutils/sort.c
@@ -652,11 +652,12 @@ int sort_main(int argc UNUSED_PARAM, char **argv)
         /* Handle -u */
         if (option_mask32 & FLAG_u) {
                 int j = 0;
-                /* coreutils 6.3 drop lines for which only key is the same
-                 * -- disabling last-resort compare, or else compare_keys()
-                 * will be the same only for completely identical lines.
+                /* coreutils 6.3 drop lines for which only key is the same:
+                 * - disabling last-resort compare, or else compare_keys()
+                 * will be the same only for completely identical lines
+                 * - disabling -s (same reasons)
                  */
-                option_mask32 |= FLAG_no_tie_break;
+                option_mask32 = (option_mask32 | FLAG_no_tie_break) & (~FLAG_s);
                 for (i = 1; i < linecount; i++) {
                         if (compare_keys(&lines[j], &lines[i]) == 0)
                                 free(lines[i]);