diff --git a/meson.build b/meson.build
index 0ef4cdaaf..2acd8c3e8 100644
--- a/meson.build
+++ b/meson.build
@@ -95,6 +95,7 @@ if cc.has_header_symbol('stdlib.h', 'secure_getenv', prefix : '#define _GNU_SOUR
 endif
 
 common_arguments = [
+    '-Wmissing-declarations',
     '-Wshadow',
     '-include', meson.current_build_dir() / 'config.h',
 ]