diff --git a/drive-health/packaging/set-collector-interval.sh b/drive-health/packaging/set-collector-interval.sh
index 3d50835..d9118d3 100755
--- a/drive-health/packaging/set-collector-interval.sh
+++ b/drive-health/packaging/set-collector-interval.sh
@@ -18,7 +18,9 @@ dropin_path="$dropin_dir/interval.conf"
 temporary=$(mktemp)
 trap 'rm -f -- "$temporary"' EXIT
 
-printf '[Timer]\nOnUnitActiveSec=\nOnUnitActiveSec=%smin\n' "$interval_minutes" >"$temporary"
+# Resetting a monotonic timer also removes OnBootSec inherited from the base
+# unit, so the drop-in must restore both triggers.
+printf '[Timer]\nOnUnitActiveSec=\nOnBootSec=20s\nOnUnitActiveSec=%smin\n' "$interval_minutes" >"$temporary"
 install -d -m0755 "$dropin_dir"
 install -m0644 "$temporary" "$dropin_path"
 
diff --git a/drive-health/packaging/uninstall-system-collector.sh b/drive-health/packaging/uninstall-system-collector.sh
index 0843949..3ccfd99 100755
--- a/drive-health/packaging/uninstall-system-collector.sh
+++ b/drive-health/packaging/uninstall-system-collector.sh
@@ -15,6 +15,7 @@ rm -f \
   "/etc/systemd/system/$service_name.service" \
   "/etc/systemd/system/$service_name.timer"
 rm -rf \
+  "/etc/systemd/system/$service_name.timer.d" \
   "/usr/local/libexec/$service_name" \
   "/run/$service_name"
 
diff --git a/drive-health/plugin.toml b/drive-health/plugin.toml
index 0b01730..9866493 100644
--- a/drive-health/plugin.toml
+++ b/drive-health/plugin.toml
@@ -1,6 +1,6 @@
 id = "gustav0ar/drive-health"
 name = "Drive Health"
-version = "1.2.3"
+version = "1.2.4"
 plugin_api = 9
 author = "Drive Health contributors"
 license = "MIT"
diff --git a/drive-health/tests/test_packaging.sh b/drive-health/tests/test_packaging.sh
index 7cfeec4..5a14d44 100644
--- a/drive-health/tests/test_packaging.sh
+++ b/drive-health/tests/test_packaging.sh
@@ -20,8 +20,11 @@ grep -q '^OnUnitActiveSec=15min$' "$fixture/noctalia-drive-health.timer"
 
 bash -n "$interval_script"
 bash -n "$manage_script"
+grep -Fq "OnUnitActiveSec=\\nOnBootSec=20s\\nOnUnitActiveSec=%smin" "$interval_script"
 grep -q 'packaging/manage-collector.sh' "$project_dir/packaging/install-system-collector.sh"
 grep -q 'packaging/uninstall-system-collector.sh' "$project_dir/packaging/install-system-collector.sh"
+grep -Fq '"/etc/systemd/system/$service_name.timer.d"' \
+  "$project_dir/packaging/uninstall-system-collector.sh"
 
 if grep -R -q 'noctalia-smart-monito[r]' "$project_dir"; then
   echo "generic legacy collector namespace must not be read, modified, or removed" >&2