diff --git a/ui/gtk/main_welcome.c b/ui/gtk/main_welcome.c
index 75eaee8dfe..a7fec6cef7 100644
--- a/ui/gtk/main_welcome.c
+++ b/ui/gtk/main_welcome.c
@@ -757,7 +757,7 @@ gboolean on_selection_changed(GtkTreeSelection *selection _U_,
 }
 
 void
-set_sensitivity_for_start_icon()
+set_sensitivity_for_start_icon(void)
 {
     gboolean enable = (global_capture_opts.num_selected > 0);