diff --git a/tests/cktools/grpck/29_grpck_sort_readonly/data/usage.out b/tests/cktools/grpck/29_grpck_sort_readonly/data/usage.out
index bbe34e36..cd278fa5 100644
--- a/tests/cktools/grpck/29_grpck_sort_readonly/data/usage.out
+++ b/tests/cktools/grpck/29_grpck_sort_readonly/data/usage.out
@@ -1 +1 @@
-grpck: -s and -r are incompatibile
+grpck: -s and -r are incompatible