diff --git a/modules/services/borgmatic.nix b/modules/services/borgmatic.nix
index f5368cdfc..c2f2963a2 100644
--- a/modules/services/borgmatic.nix
+++ b/modules/services/borgmatic.nix
@@ -63,6 +63,7 @@ in {
           ExecStart = ''
             ${pkgs.systemd}/bin/systemd-inhibit \
               --who="borgmatic" \
+              --what="sleep:shutdown" \
               --why="Prevent interrupting scheduled backup" \
               ${programConfig.package}/bin/borgmatic \
                 --stats \
diff --git a/tests/modules/services/borgmatic/basic-configuration.service b/tests/modules/services/borgmatic/basic-configuration.service
index 4840f11bc..80713fd90 100644
--- a/tests/modules/services/borgmatic/basic-configuration.service
+++ b/tests/modules/services/borgmatic/basic-configuration.service
@@ -2,6 +2,7 @@
 CPUSchedulingPolicy=batch
 ExecStart=/nix/store/00000000000000000000000000000000-systemd/bin/systemd-inhibit \
   --who="borgmatic" \
+  --what="sleep:shutdown" \
   --why="Prevent interrupting scheduled backup" \
   @borgmatic@/bin/borgmatic \
     --stats \