diff --git a/src/notification.c b/src/notification.c
index 4e9f74c..b16d671 100644
--- a/src/notification.c
+++ b/src/notification.c
@@ -454,7 +454,7 @@ void notification_init(struct notification *n)
 
         if (g_str_has_prefix(n->summary, "DUNST_COMMAND_")) {
                 char *msg = "DUNST_COMMAND_* has been removed, please switch to dunstctl. See #830 for more details. https://github.com/dunst-project/dunst/pull/830";
-                LOG_W(msg);
+                LOG_W("%s", msg);
                 n->body = string_append(n->body, msg, "\n");
         }