1 files changed, 1 insertions, 1 deletions

diff --git a/include/sway/debug.h b/include/sway/debug.h
index bf3a5f6d..0e9bb056 100644
--- a/include/sway/debug.h
+++ b/include/sway/debug.h
@@ -17,6 +17,6 @@ struct sway_debug {
 
 extern struct sway_debug debug;
 
-void update_debug_tree();
+void update_debug_tree(void);
 
 #endif