diff --git a/viz/curses/waterfall.c b/viz/curses/waterfall.c
index 7dbadf3..9d0f3dc 100644
--- a/viz/curses/waterfall.c
+++ b/viz/curses/waterfall.c
@@ -100,12 +100,18 @@ return -1;
 /* ---------------------------------------------------------------- */
 int close_waterfall(WINDOW *wf, int notused)
 {
+int foo;
 
 if (NULL == wf) {
 	fprintf(stderr, "%s wf is null\n", __func__);
 	return -1;
 	}
 
+foo = delwin(wf);
+if (ERR==foo) {
+	fprintf(stderr, "%s : err on delwin\n", __func__);
+	return -1;
+	}
 return 0;
 }
 /* ---------------------------------------------------------------- */