diff --git a/tests/test_compress.py b/tests/test_compress.py
index b2df537..1fd605b 100644
--- a/tests/test_compress.py
+++ b/tests/test_compress.py
@@ -52,5 +52,5 @@
 def test_bug27():
     compressed = pystare.to_compressed_range(sids)
     expanded = pystare.expand_intervals(compressed, -1, False)
-    numpy.testing.assert_array_equal(expanded, expanded_stare_test)
+    assert numpy.testing.assert_array_equal(expanded, expanded_stare_test)