diff --git a/nixos/modules/i18n/input-method/fcitx5.nix b/nixos/modules/i18n/input-method/fcitx5.nix
index b4b887606e9..9ef0285f7b9 100644
--- a/nixos/modules/i18n/input-method/fcitx5.nix
+++ b/nixos/modules/i18n/input-method/fcitx5.nix
@@ -32,6 +32,7 @@ in {
         GTK_IM_MODULE = "fcitx";
         QT_IM_MODULE = "fcitx";
         XMODIFIERS = "@im=fcitx";
+        QT_PLUGIN_PATH = [ "${fcitx5Package}/${pkgs.qt6.qtbase.qtPluginPrefix}" ];
       };
     }
     (mkIf whetherRimeDataDir {
diff --git a/pkgs/tools/inputmethods/fcitx5/fcitx5-qt.nix b/pkgs/tools/inputmethods/fcitx5/fcitx5-qt.nix
index 2b0400d8db9..b903ee6dae5 100644
--- a/pkgs/tools/inputmethods/fcitx5/fcitx5-qt.nix
+++ b/pkgs/tools/inputmethods/fcitx5/fcitx5-qt.nix
@@ -8,6 +8,7 @@
 , libxcb
 , libXdmcp
 , qtbase
+, qt6
 }:
 
 mkDerivation rec {
@@ -24,11 +25,15 @@ mkDerivation rec {
   preConfigure = ''
     substituteInPlace qt5/platforminputcontext/CMakeLists.txt \
       --replace \$"{CMAKE_INSTALL_QT5PLUGINDIR}" $out/${qtbase.qtPluginPrefix}
+    substituteInPlace qt6/platforminputcontext/CMakeLists.txt \
+      --replace \$"{CMAKE_INSTALL_QT6PLUGINDIR}" $out/${qt6.qtbase.qtPluginPrefix}
   '';
 
   cmakeFlags = [
+    # adding qt6 to buildInputs would result in error: detected mismatched Qt dependencies
+    "-DCMAKE_PREFIX_PATH=${qt6.qtbase.dev}"
     "-DENABLE_QT4=0"
-    "-DENABLE_QT6=0"
+    "-DENABLE_QT6=1"
   ];
 
   nativeBuildInputs = [