diff --git a/meson.build b/meson.build
index 8d64ec47..311c6e4a 100644
--- a/meson.build
+++ b/meson.build
@@ -30,7 +30,6 @@ opt_fltk.add_cmake_defines(
         'FLTK_BUILD_TEST': false,
         'FLTK_BUILD_OPTIONS': false,
         'FLTK_BUILD_SHARED_LIBS': true,
-        'FLTK_BACKEND_X11': true,
         'CMAKE_POSITION_INDEPENDENT_CODE': true,
     },
 )
@@ -308,4 +307,4 @@ pconf.generate(
     vs_fltk,
     description: 'VS fltk library (C interface only)',
     url: 'https://github.com/KaruroChori/vs-fltk/',
-)
\ No newline at end of file
+)