diff --git a/header_checks/meson.build b/header_checks/meson.build
index e54e17943c..01e557e95f 100644
--- a/header_checks/meson.build
+++ b/header_checks/meson.build
@@ -174,4 +174,7 @@ endif
 
 if config_h.has('HAVE_KEVENT')
   config_h.set('HAVE_NOTIFY_KEVENT', '1')
-endif
\ No newline at end of file
+endif
+
+config_h.set('SIZEOF_INT', cc.sizeof('int'))
+config_h.set('SIZEOF_LONG', cc.sizeof('long'))