diff --git a/src/core.c b/src/core.c
index 7359f702..b9290a5f 100644
--- a/src/core.c
+++ b/src/core.c
@@ -1028,6 +1028,7 @@ struct text_object *construct_text_object(const char *s, const char *arg, long
 	 * handler. */
 	if (strncmp(s, "top", 3) == EQUAL) {
 		add_update_callback(&update_meminfo);
+		add_update_callback(&update_top);
 		if (!parse_top_args(s, arg, obj)) {
 			return NULL;
 		}