diff --git a/src/Listen.hxx b/src/Listen.hxx
index b644c3a8d..1e24d47f8 100644
--- a/src/Listen.hxx
+++ b/src/Listen.hxx
@@ -29,6 +29,7 @@ extern int listen_port;
 bool
 listen_global_init(EventLoop &loop, Partition &partition, Error &error);
 
-void listen_global_finish(void);
+void
+listen_global_finish();
 
 #endif