diff --git a/i3bar/src/xcb.c b/i3bar/src/xcb.c
index 5e21e118..60821167 100644
--- a/i3bar/src/xcb.c
+++ b/i3bar/src/xcb.c
@@ -1425,6 +1425,8 @@ void init_tray(void) {
         return;
     }
 
+    free(selreply);
+
     send_tray_clientmessage();
 }