diff --git a/sbin/sysctl/tests/sysctl_test.sh b/sbin/sysctl/tests/sysctl_test.sh
index dfc32a87b21..b4cc7180a0f 100644
--- a/sbin/sysctl/tests/sysctl_test.sh
+++ b/sbin/sysctl/tests/sysctl_test.sh
@@ -41,6 +41,7 @@ sysctl_aflag_body()
 	# output and it would all otherwise be saved.
 	sysctl -ao >/dev/null 2>stderr
 	if [ $? -ne 0 ]; then
+		cat stderr
 		atf_fail "sysctl -ao failed"
 	elif [ -s stderr ]; then
 		cat stderr