diff --git a/modules/misc/gtk.nix b/modules/misc/gtk.nix
index 0cc9146d8..6687a33be 100644
--- a/modules/misc/gtk.nix
+++ b/modules/misc/gtk.nix
@@ -250,8 +250,8 @@ in {
     ];
 
     home.file.${cfg2.configLocation}.text =
-      concatStringsSep "\n" (mapAttrsToList formatGtk2Option gtkIni)
-      + cfg2.extraConfig;
+      concatMapStrings (l: l + "\n") (mapAttrsToList formatGtk2Option gtkIni)
+      + cfg2.extraConfig + "\n";
 
     home.sessionVariables.GTK2_RC_FILES = cfg2.configLocation;
 
@@ -262,7 +262,7 @@ in {
       mkIf (cfg3.extraCss != "") { text = cfg3.extraCss; };
 
     xdg.configFile."gtk-3.0/bookmarks" = mkIf (cfg3.bookmarks != [ ]) {
-      text = concatStringsSep "\n" cfg3.bookmarks;
+      text = concatMapStrings (l: l + "\n") cfg3.bookmarks;
     };
 
     xdg.configFile."gtk-4.0/settings.ini".text =
diff --git a/tests/modules/misc/gtk/gtk2-basic-config-expected.conf b/tests/modules/misc/gtk/gtk2-basic-config-expected.conf
index 2e4c1c368..4096a8477 100644
--- a/tests/modules/misc/gtk/gtk2-basic-config-expected.conf
+++ b/tests/modules/misc/gtk/gtk2-basic-config-expected.conf
@@ -1 +1,2 @@
-gtk-can-change-accels = 1
\ No newline at end of file
+gtk-theme-name = "Adwaita"
+gtk-can-change-accels = 1
diff --git a/tests/modules/misc/gtk/gtk2-basic-config.nix b/tests/modules/misc/gtk/gtk2-basic-config.nix
index 228b5478d..5671ac93e 100644
--- a/tests/modules/misc/gtk/gtk2-basic-config.nix
+++ b/tests/modules/misc/gtk/gtk2-basic-config.nix
@@ -6,6 +6,7 @@ with lib;
   config = {
     gtk = {
       enable = true;
+      theme.name = "Adwaita";
       gtk2.extraConfig = "gtk-can-change-accels = 1";
     };