diff --git a/src/settings.cc b/src/settings.cc
index df776c3b..e06d4964 100644
--- a/src/settings.cc
+++ b/src/settings.cc
@@ -83,6 +83,7 @@ setting_details all_settings[] = {
 };
 
 static_assert((sizeof(all_settings)/sizeof(all_settings[0]))
-        == static_cast<unsigned>(setting_id_t::LAST) + 1);
+        == static_cast<unsigned>(setting_id_t::LAST) + 1,
+        "setting_id_t::LAST doesn't match the size of all_settings[]");
 
 } // dinit_load namespace