diff --git a/src/qt/CMakeLists.txt b/src/qt/CMakeLists.txt
index 614da7a00..944b3359a 100644
--- a/src/qt/CMakeLists.txt
+++ b/src/qt/CMakeLists.txt
@@ -385,6 +385,7 @@ if (UNIX AND NOT APPLE AND NOT HAIKU)
                 target_compile_definitions(ui PRIVATE XKBCOMMON_X11)
                 target_link_libraries(ui PRIVATE X11::xcb PUBLIC PkgConfig::XKBCOMMON_X11)
                 target_sources(ui PRIVATE xkbcommon_x11_keyboard.cpp)
+                set(QT5_PRIVATE_HEADERS ON)
             endif()
         endif()
     endif()
@@ -406,9 +407,18 @@ if (UNIX AND NOT APPLE AND NOT HAIKU)
                     target_sources(ui PRIVATE xkbcommon_wl_keyboard.cpp)
                 endif()
                 target_compile_definitions(ui PRIVATE WAYLAND)
+                set(QT5_PRIVATE_HEADERS ON)
             endif()
         endif()
     endif()
+
+    # Add private headers for Qt5 if required.
+    if (NOT USE_QT6 AND DEFINED QT5_PRIVATE_HEADERS)
+        find_package(Qt${QT_MAJOR}Gui)
+        if (Qt${QT_MAJOR}Gui_FOUND)
+            include_directories(${Qt${QT_MAJOR}Gui_PRIVATE_INCLUDE_DIRS})
+        endif()
+    endif()
 endif()
 set(QM_FILES)
 file(GLOB po_files "${CMAKE_CURRENT_SOURCE_DIR}/languages/*.po")