diff --git a/tests/brief-vs-stat-zero-kernel-lies b/tests/brief-vs-stat-zero-kernel-lies
index 9b272c6..29eacae 100755
--- a/tests/brief-vs-stat-zero-kernel-lies
+++ b/tests/brief-vs-stat-zero-kernel-lies
@@ -24,7 +24,7 @@ compare /dev/null out || fail=1
 # so construct the expected output here:
 printf 'diff\0--brief\0/proc/self/cmdline\0bin\0' > bin || framework_failure_
 # And run the command that is embedded in that output:
-diff --brief /proc/self/cmdline bin > out 2>&1 || fail=1
+diff -a --brief /proc/self/cmdline bin > out 2>&1 || fail=1
 compare /dev/null out || fail=1

 Exit $fail