diff --git a/doc/getting-started.dox b/doc/getting-started.dox
index 4344d28b9..9e9f35dd5 100644
--- a/doc/getting-started.dox
+++ b/doc/getting-started.dox
@@ -104,7 +104,7 @@ the `SDL2-2.0.10` directory to `CMAKE_PREFIX_PATH`:
 ...
 
 set(CMAKE_PREFIX_PATH ${PROJECT_SOURCE_DIR}/SDL2-2.0.10 ${CMAKE_PREFIX_PATH})
-set(WITH_SDL2APPLICATION ON)
+set(WITH_SDL2APPLICATION ON CACHE BOOL "" FORCE)
 add_subdirectory(magnum EXCLUDE_FROM_ALL)
 @endcode