diff --git a/src/core/bpf-firewall.c b/src/core/bpf-firewall.c
index 2d154710e0..3c1c02e444 100644
--- a/src/core/bpf-firewall.c
+++ b/src/core/bpf-firewall.c
@@ -914,7 +914,10 @@ int bpf_firewall_supported(void) {
 void emit_bpf_firewall_warning(Unit *u) {
         static bool warned = false;
 
-        if (!warned) {
+        assert(u);
+        assert(u->manager);
+
+        if (!warned && !MANAGER_IS_TEST_RUN(u->manager)) {
                 bool quiet = bpf_firewall_unsupported_reason == -EPERM && detect_container() > 0;
 
                 log_unit_full_errno(u, quiet ? LOG_DEBUG : LOG_WARNING, bpf_firewall_unsupported_reason,
diff --git a/test/units/testsuite-65.sh b/test/units/testsuite-65.sh
index 245f74c5d9..867a77a1b7 100755
--- a/test/units/testsuite-65.sh
+++ b/test/units/testsuite-65.sh
@@ -4,6 +4,7 @@
 set -eux
 
 systemd-analyze log-level debug
+export SYSTEMD_LOG_LEVEL=debug
 
 mkdir -p /tmp/img/usr/lib/systemd/system/
 mkdir -p /tmp/img/opt/