diff --git a/modules/system/impermanence.nix b/modules/system/impermanence.nix
index a8d2040..83e4438 100644
--- a/modules/system/impermanence.nix
+++ b/modules/system/impermanence.nix
@@ -33,6 +33,7 @@ in
         "/var/log"
       ]
       ++ config.custom.persist.directories;
+
       files = [
         "/etc/machine-id"
         "/etc/ssh/ssh_host_ed25519_key"
diff --git a/modules/system/web-services/grafana.nix b/modules/system/web-services/grafana.nix
index 7185158..8a0e92f 100644
--- a/modules/system/web-services/grafana.nix
+++ b/modules/system/web-services/grafana.nix
@@ -86,7 +86,7 @@ in
 
         datasources.settings = {
           prune = true;
-          datasources =
+          datasources = lib.concatLists [
             (lib.optional cfg.datasources.prometheus.enable {
               name = "Prometheus";
               type = "prometheus";
@@ -97,18 +97,19 @@ in
                 prometheusVersion = "2.50.0";
               };
             })
-            ++ (lib.optional cfg.datasources.victoriametrics.enable {
+            (lib.optional cfg.datasources.victoriametrics.enable {
               name = "VictoriaMetrics";
               type = "victoriametrics-metrics-datasource";
               inherit (cfg.datasources.victoriametrics) url;
               isDefault = false;
             })
-            ++ (lib.optional cfg.datasources.victorialogs.enable {
+            (lib.optional cfg.datasources.victorialogs.enable {
               name = "VictoriaLogs";
               type = "victoriametrics-logs-datasource";
               inherit (cfg.datasources.victorialogs) url;
               isDefault = false;
-            });
+            })
+          ];
         };
       };
 
diff --git a/modules/system/web-services/memos.nix b/modules/system/web-services/memos.nix
index a96792e..da0c726 100644
--- a/modules/system/web-services/memos.nix
+++ b/modules/system/web-services/memos.nix
@@ -29,9 +29,10 @@ in
   };
 
   config = lib.mkIf cfg.enable {
-    warnings =
-      lib.optional (lib.pathExists "${modulesPath}/services/misc/memos.nix") "TODO: Use memos module from stable nixpkgs"
-      ++ lib.optional (lib.versionAtLeast lib.version "25.11") "TODO: Use memos package from stable nixpkgs";
+    warnings = lib.concatLists [
+      (lib.optional (lib.pathExists "${modulesPath}/services/misc/memos.nix") "TODO: Use memos module from stable nixpkgs")
+      (lib.optional (lib.versionAtLeast lib.version "25.11") "TODO: Use memos package from stable nixpkgs")
+    ];
 
     meta = {
       domains.list = [ cfg.domain ];