diff --git a/test/lib/json.c b/test/lib/json.c
index 0cddddcb2a3..1c5c9215cc3 100644
--- a/test/lib/json.c
+++ b/test/lib/json.c
@@ -539,6 +539,7 @@ static int lib_test_json_to_fdt_luks2(struct unit_test_state *uts)
 	/* Check keyslots_size (stored as string in JSON) */
 	ut_asserteq_str("3145728", ofnode_read_string(config, "keyslots_size"));
 
+	oftree_dispose(tree);
 	abuf_uninit(&buf);
 
 	return 0;