diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
index 8b5ce46..4609b1f 100644
--- a/external/CMakeLists.txt
+++ b/external/CMakeLists.txt
@@ -32,7 +32,7 @@ if (LINUX AND NOT DESKTOP_APP_DISABLE_DBUS_INTEGRATION)
     add_checked_subdirectory(glibmm)
 endif()
 add_checked_subdirectory(gsl)
-if (LINUX AND NOT DESKTOP_APP_DISABLE_X11_INTEGRATION AND NOT DESKTOP_APP_QT6)
+if (LINUX AND NOT DESKTOP_APP_DISABLE_X11_INTEGRATION)
     add_checked_subdirectory(hime_qt)
 endif()
 if (add_hunspell_library)
diff --git a/external/qt/qt_static_plugins/CMakeLists.txt b/external/qt/qt_static_plugins/CMakeLists.txt
index 5fad7e3..e6668af 100644
--- a/external/qt/qt_static_plugins/CMakeLists.txt
+++ b/external/qt/qt_static_plugins/CMakeLists.txt
@@ -40,7 +40,7 @@ if (LINUX)
         endif()
     endif()
 
-    if (NOT DESKTOP_APP_DISABLE_X11_INTEGRATION AND NOT DESKTOP_APP_QT6)
+    if (NOT DESKTOP_APP_DISABLE_X11_INTEGRATION)
         target_link_libraries(external_qt_static_plugins
         PUBLIC
             desktop-app::external_hime_qt
diff --git a/external/qt/qt_static_plugins/qt_static_plugins.cpp b/external/qt/qt_static_plugins/qt_static_plugins.cpp
index d10f99b..de7e757 100644
--- a/external/qt/qt_static_plugins/qt_static_plugins.cpp
+++ b/external/qt/qt_static_plugins/qt_static_plugins.cpp
@@ -63,9 +63,7 @@ Q_IMPORT_PLUGIN(QFcitx5PlatformInputContextPlugin)
 #endif // !DESKTOP_APP_DISABLE_X11_INTEGRATION
 #endif // !DESKTOP_APP_DISABLE_DBUS_INTEGRATION
 #ifndef DESKTOP_APP_DISABLE_X11_INTEGRATION
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
 Q_IMPORT_PLUGIN(QHimePlatformInputContextPlugin)
-#endif // Qt < 6.0.0
 #endif // !DESKTOP_APP_DISABLE_X11_INTEGRATION
 #endif // !DESKTOP_APP_USE_PACKAGED || DESKTOP_APP_USE_PACKAGED_LAZY
 #endif // Q_OS_UNIX && !Q_OS_MAC