diff --git a/binding/meson.build b/binding/meson.build
index 6bad0356..c3b4af45 100644
--- a/binding/meson.build
+++ b/binding/meson.build
@@ -3,6 +3,8 @@ if get_option('mri_includes') == ''
     ver = get_option('mri_version')
     if ver.version_compare('<=1.8')
         global_args += '-DLEGACY_RUBY'
+    else if ver.version_compare('>=3.0')
+        global_args += '-fdeclspec'
     endif
     global_dependencies += dependency('ruby-' + ver)
 else