diff --git a/tests/testthat/test-nat.R b/tests/testthat/test-nat.R
index 08bb4a2..574dc80 100644
--- a/tests/testthat/test-nat.R
+++ b/tests/testthat/test-nat.R
@@ -1,5 +1,5 @@
 test_that("read.neurons.vfb works", {
   expect_s3_class(oavpm3 <- read.neurons.vfb("octopaminergic VPM3 neuron"), 'neuronlist')
-  expect_equal(unique(oavpm3[,'parents_label']),
+  expect_equal(unique(unlist(oavpm3[,'parents_label'])),
                "octopaminergic VPM3 neuron")
 })