diff --git a/meson.build b/meson.build
index e08a7662a7..f4a948cd65 100644
--- a/meson.build
+++ b/meson.build
@@ -345,6 +345,7 @@ possible_common_cc_flags = [
         '-Werror=shift-count-overflow',
         '-Werror=shift-overflow=2',
         '-Werror=undef',
+        '-Werror=unused-function',
         '-Wfloat-equal',
         '-Wimplicit-fallthrough=5',
         '-Winit-self',