diff --git a/test/TEST-74-AUX-UTILS/TEST-74-AUX-UTILS.units/realtime-test.service b/test/TEST-74-AUX-UTILS/TEST-74-AUX-UTILS.units/realtime-test.service
new file mode 100644
index 0000000000..a754626828
--- /dev/null
+++ b/test/TEST-74-AUX-UTILS/TEST-74-AUX-UTILS.units/realtime-test.service
@@ -0,0 +1,6 @@
+[Unit]
+Description=Testing systemd timers
+
+[Service]
+Type=simple
+ExecStart=sh -c 'date +%%s >>/tmp/realtime-test.log ; sleep 5'
diff --git a/test/TEST-74-AUX-UTILS/TEST-74-AUX-UTILS.units/realtime-test.timer b/test/TEST-74-AUX-UTILS/TEST-74-AUX-UTILS.units/realtime-test.timer
new file mode 100644
index 0000000000..b870b41628
--- /dev/null
+++ b/test/TEST-74-AUX-UTILS/TEST-74-AUX-UTILS.units/realtime-test.timer
@@ -0,0 +1,10 @@
+[Unit]
+Description=Testing systemd timers
+
+[Timer]
+OnCalendar=*:*:0/5
+AccuracySec=1us
+DeferReactivation=true
+
+[Install]
+WantedBy=timers.target
diff --git a/test/TEST-74-AUX-UTILS/meson.build b/test/TEST-74-AUX-UTILS/meson.build
index 668ad492ca..543eee195f 100644
--- a/test/TEST-74-AUX-UTILS/meson.build
+++ b/test/TEST-74-AUX-UTILS/meson.build
@@ -7,3 +7,5 @@ integration_tests += [
                 'vm' : true,
         },
 ]
+
+testdata_subdirs += [meson.current_source_dir() / 'TEST-74-AUX-UTILS.units']
diff --git a/test/units/TEST-74-AUX-UTILS.defer_reactivation.sh b/test/units/TEST-74-AUX-UTILS.defer_reactivation.sh
new file mode 100755
index 0000000000..d1b113d1ab
--- /dev/null
+++ b/test/units/TEST-74-AUX-UTILS.defer_reactivation.sh
@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: LGPL-2.1-or-later
+set -eux
+set -o pipefail
+
+systemctl start realtime-test.timer
+
+sleep 35
+mindelta=10
+
+last=
+while read -r time; do
+    if [ -n "$last" ]; then
+        delta=$((time - last))
+        if [ "$delta" -lt $mindelta ]; then
+            echo "Timer fired too early: $delta < $mindelta" >/failed
+            break
+        fi
+    fi
+    last=$time
+done </tmp/realtime-test.log
+
+test ! -s /failed