diff --git a/meson.build b/meson.build
index a99d1a48..7ce9d901 100644
--- a/meson.build
+++ b/meson.build
@@ -12,7 +12,8 @@ is_debug_build = get_option('buildtype').startswith('debug')
 
 cc = meson.get_compiler('c')
 
-if cc.has_function('memfd_create')
+if cc.has_function('memfd_create',
+                   args: ['-D_GNU_SOURCE'], prefix: '#include <sys/mman.h>')
   add_project_arguments('-DMEMFD_CREATE', language: 'c')
 endif