diff --git a/modules/home-manager/fcitx5.nix b/modules/home-manager/fcitx5.nix
index 9e9fdea..6bd113a 100644
--- a/modules/home-manager/fcitx5.nix
+++ b/modules/home-manager/fcitx5.nix
@@ -9,7 +9,16 @@ let
   enable = cfg.enable && config.i18n.inputMethod.enabled == "fcitx5";
 in
 {
-  options.i18n.inputMethod.fcitx5.catppuccin = ctp.mkCatppuccinOpt "Fcitx5";
+  options.i18n.inputMethod.fcitx5.catppuccin = ctp.mkCatppuccinOpt "Fcitx5" // {
+    apply = lib.mkOption {
+      type = lib.types.bool;
+      default = true;
+      description = ''
+        Applies the theme by overwriting `$XDG_CONFIG_HOME/fcitx5/conf/classicui.conf`.
+        If this is disabled, you must manually set the theme (e.g. by using `fcitx5-configtool`).
+      '';
+    };
+  };
 
   config = lib.mkIf enable {
     assertions = [
@@ -21,8 +30,10 @@ in
       recursive = true;
     };
 
-    xdg.configFile."fcitx5/conf/classicui.conf".text = lib.generators.toINIWithGlobalSection { } {
-      globalSection.Theme = "catppuccin-${cfg.flavour}";
-    };
+    xdg.configFile."fcitx5/conf/classicui.conf" = lib.mkIf cfg.apply ({
+      text = lib.generators.toINIWithGlobalSection { } {
+        globalSection.Theme = "catppuccin-${cfg.flavour}";
+      };
+    });
   };
 }