diff --git a/squid-cache/tests/00_start_iptables_cert.sh b/squid-cache/tests/00_start_iptables_cert.sh
index 5babb5d..2211cd6 100755
--- a/squid-cache/tests/00_start_iptables_cert.sh
+++ b/squid-cache/tests/00_start_iptables_cert.sh
@@ -4,7 +4,7 @@ if ! command -v systemctl >/dev/null 2>&1; then exit 0; fi
 if ! systemctl is-system-running >/dev/null 2>&1; then exit 0; fi
 if ! command -v iptables >/dev/null 2>&1; then exit 0; fi
 o=$(mktemp)
-bash "$SQUID" start >"$o"
+bash "$SQUID" start >"$o" || { journalctl -xeu squid.service; exit 1; }
 [ "$(tail -n1 "$o")" = started ]
 iptables -t nat -S | grep -q SQUID_LOCAL
 [ -f /usr/local/share/ca-certificates/squid-mitm.crt ]