diff --git a/src/window.c b/src/window.c
index 7f12a29de5..3b574fea36 100644
--- a/src/window.c
+++ b/src/window.c
@@ -720,6 +720,7 @@ void window_init_scroll_widgets(rct_window *w)
 		}
 
 		scroll = &w->scrolls[scroll_index];
+		scroll->flags = 0;
 		window_get_scroll_size(w, scroll_index, &width, &height);
 		scroll->h_left = 0;
 		scroll->h_right = width + 1;