diff --git a/cmd-list-keys.c b/cmd-list-keys.c
index c88bea2b..8f957c84 100644
--- a/cmd-list-keys.c
+++ b/cmd-list-keys.c
@@ -54,6 +54,8 @@ cmd_list_keys_exec(struct cmd *self, struct cmd_ctx *ctx)
 		return (cmd_list_keys_table(self, ctx));
 
 	width = 0;
+	*flags = '\0';
+
 	SPLAY_FOREACH(bd, key_bindings, &key_bindings) {
 		key = key_string_lookup_key(bd->key & ~KEYC_PREFIX);
 		if (key == NULL)