diff --git a/nixos/modules/i18n/input-method/fcitx5.nix b/nixos/modules/i18n/input-method/fcitx5.nix
index 530727f3f292..2e87705c6dc2 100644
--- a/nixos/modules/i18n/input-method/fcitx5.nix
+++ b/nixos/modules/i18n/input-method/fcitx5.nix
@@ -5,7 +5,10 @@ with lib;
 let
   im = config.i18n.inputMethod;
   cfg = im.fcitx5;
-  fcitx5Package = pkgs.fcitx5-with-addons.override { inherit (cfg) addons; };
+  fcitx5Package =
+    if cfg.plasma6Support
+    then pkgs.qt6Packages.fcitx5-with-addons.override { inherit (cfg) addons; }
+    else pkgs.libsForQt5.fcitx5-with-addons.override { inherit (cfg) addons; };
   settingsFormat = pkgs.formats.ini { };
 in
 {
@@ -27,6 +30,14 @@ in
           See [Using Fcitx 5 on Wayland](https://fcitx-im.org/wiki/Using_Fcitx_5_on_Wayland).
         '';
       };
+      plasma6Support = mkOption {
+        type = types.bool;
+        default = false;
+        description = lib.mdDoc ''
+          Use qt6 versions of fcitx5 packages.
+          Required for configuring fcitx5 in KDE System Settings.
+        '';
+      };
       quickPhrase = mkOption {
         type = with types; attrsOf str;
         default = { };