diff --git a/modules/homelab/services/smarthome/homeassistant/default.nix b/modules/homelab/services/smarthome/homeassistant/default.nix
index 7a0cea3..71de038 100644
--- a/modules/homelab/services/smarthome/homeassistant/default.nix
+++ b/modules/homelab/services/smarthome/homeassistant/default.nix
@@ -139,7 +139,7 @@ in
 
     # add to backups
     modules.system.backups.baks = {
-      ${service} = { paths = [ cfg.data_dir ]; };
+      "${service}" = { paths = [ cfg.data_dir ]; };
     };
   };
 }
diff --git a/modules/homelab/services/smarthome/mosquitto/default.nix b/modules/homelab/services/smarthome/mosquitto/default.nix
index 8318f47..c06183e 100644
--- a/modules/homelab/services/smarthome/mosquitto/default.nix
+++ b/modules/homelab/services/smarthome/mosquitto/default.nix
@@ -98,7 +98,7 @@ in
 
     # add to backups
     modules.system.backups.baks = {
-      ${service} = { paths = [ cfg.data_dir ]; };
+      "${service}" = { paths = [ cfg.data_dir ]; };
     };
   };
 }
diff --git a/modules/homelab/services/smarthome/zigbee2mqtt/default.nix b/modules/homelab/services/smarthome/zigbee2mqtt/default.nix
index 6c24146..482b7ac 100644
--- a/modules/homelab/services/smarthome/zigbee2mqtt/default.nix
+++ b/modules/homelab/services/smarthome/zigbee2mqtt/default.nix
@@ -113,7 +113,7 @@ in
 
     # add to backups
     modules.system.backups.baks = {
-      ${service} = { paths = [ cfg.data_dir ]; };
+      "${service}" = { paths = [ cfg.data_dir ]; };
     };
   };
 }
diff --git a/modules/homelab/services/vaultwarden/default.nix b/modules/homelab/services/vaultwarden/default.nix
index 4a1e3a6..fe80aa2 100644
--- a/modules/homelab/services/vaultwarden/default.nix
+++ b/modules/homelab/services/vaultwarden/default.nix
@@ -112,7 +112,7 @@ in
 
      # add to backups
     modules.system.backups.baks = {
-      ${service} = { paths = [ cfg.data_dir ]; };
+      "${service}" = { paths = [ cfg.data_dir ]; };
     };
   };
 }