diff --git a/include/ircd/m/event/event_id.h b/include/ircd/m/event/event_id.h
index 6e2124d4f..6ee9726a6 100644
--- a/include/ircd/m/event/event_id.h
+++ b/include/ircd/m/event/event_id.h
@@ -19,9 +19,9 @@ namespace ircd::m
 {
 	bool event_id(std::nothrow_t, const event::idx &, const event::id::closure &);
 
-	event::id event_id(std::nothrow_t, const event::idx &, event::id::buf &);
+	[[gnu::warn_unused_result]] event::id event_id(std::nothrow_t, const event::idx &, event::id::buf &);
 	event::id event_id(const event::idx &, event::id::buf &);
 
-	event::id::buf event_id(std::nothrow_t, const event::idx &);
+	[[gnu::warn_unused_result]] event::id::buf event_id(std::nothrow_t, const event::idx &);
 	event::id::buf event_id(const event::idx &);
 }
diff --git a/include/ircd/m/event/index.h b/include/ircd/m/event/index.h
index d4795392c..cc7f0a92e 100644
--- a/include/ircd/m/event/index.h
+++ b/include/ircd/m/event/index.h
@@ -15,9 +15,9 @@ namespace ircd::m
 {
 	bool index(std::nothrow_t, const event::id &, const event::closure_idx &);
 
-	event::idx index(std::nothrow_t, const event::id &);
+	[[gnu::warn_unused_result]] event::idx index(std::nothrow_t, const event::id &);
 	event::idx index(const event::id &);
 
-	event::idx index(std::nothrow_t, const event &);
+	[[gnu::warn_unused_result]] event::idx index(std::nothrow_t, const event &);
 	event::idx index(const event &);
 }