diff --git a/cmake/QtAutoDetectHelpers.cmake b/cmake/QtAutoDetectHelpers.cmake
index 095a8d06bfa..ac24ed8f739 100644
--- a/cmake/QtAutoDetectHelpers.cmake
+++ b/cmake/QtAutoDetectHelpers.cmake
@@ -64,15 +64,6 @@ function(qt_auto_detect_wasm)
     endif()
 endfunction()
 
-function(qt_auto_detect_cmake_generator)
-    if(NOT CMAKE_GENERATOR MATCHES "Ninja" AND NOT QT_SILENCE_CMAKE_GENERATOR_WARNING)
-        message(WARNING
-               "The officially supported CMake generator for building Qt is Ninja. "
-               "You are using: '${CMAKE_GENERATOR}' instead. "
-               "Thus, you might encounter issues. Use at your own risk.")
-    endif()
-endfunction()
-
 function(qt_auto_detect_android)
     # We assume an Android build if any of the ANDROID_* cache variables are set.
     if(DEFINED ANDROID_SDK_ROOT
@@ -474,7 +465,6 @@ macro(qt_internal_setup_autodetect)
         list(PREPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/platforms")
     endif()
 
-    qt_auto_detect_cmake_generator()
     qt_auto_detect_cyclic_toolchain()
     qt_auto_detect_cmake_config()
     qt_auto_detect_darwin()
diff --git a/cmake/QtBuildHelpers.cmake b/cmake/QtBuildHelpers.cmake
index 327c0a536e4..8b957d603d2 100644
--- a/cmake/QtBuildHelpers.cmake
+++ b/cmake/QtBuildHelpers.cmake
@@ -1,6 +1,21 @@
 # Copyright (C) 2023 The Qt Company Ltd.
 # SPDX-License-Identifier: BSD-3-Clause
 
+function(qt_internal_validate_cmake_generator)
+    get_property(warning_shown GLOBAL PROPERTY _qt_validate_cmake_generator_warning_shown)
+
+    if(NOT warning_shown
+            AND NOT CMAKE_GENERATOR MATCHES "Ninja"
+            AND NOT QT_SILENCE_CMAKE_GENERATOR_WARNING)
+        set_property(GLOBAL PROPERTY _qt_validate_cmake_generator_warning_shown TRUE)
+        message(WARNING
+               "The officially supported CMake generator for building Qt is "
+               "Ninja / Ninja Multi-Config. "
+               "You are using: '${CMAKE_GENERATOR}' instead. "
+               "Thus, you might encounter issues. Use at your own risk.")
+    endif()
+endfunction()
+
 macro(qt_internal_set_qt_building_qt)
     # Set the QT_BUILDING_QT variable so we can verify whether we are building
     # Qt from source.
@@ -362,6 +377,7 @@ macro(qt_internal_setup_android_platform_specifics)
 endmacro()
 
 macro(qt_internal_setup_build_and_global_variables)
+    qt_internal_validate_cmake_generator()
     qt_internal_set_qt_building_qt()
     qt_internal_compute_features_from_possible_inputs()