diff --git a/src/acme.c b/src/acme.c
index 7f7a4c649..791178ba7 100644
--- a/src/acme.c
+++ b/src/acme.c
@@ -712,7 +712,7 @@ static int cfg_postsection_acme()
 		}
 
 		if ((bio = BIO_new_file(store->path, "w+")) == NULL) {
-			ha_alert("acme: out of memory.\n");
+			ha_alert("acme: cannot create the file '%s', check your permissions.\n", cur_acme->account.file);
 			err_code |= ERR_ALERT | ERR_FATAL | ERR_ABORT;
 			goto out;
 		}