diff --git a/tests/normalizing/test_system.py b/tests/normalizing/test_system.py
index a037133c0a844336cfa3c6d04c5e8345584c0120..fec14d7a12a48163737257ba1254ed6a068faba5 100644
--- a/tests/normalizing/test_system.py
+++ b/tests/normalizing/test_system.py
@@ -124,7 +124,7 @@ def test_normalizer_faulty_matid(caplog):
 def test_normalizer_single_string_atom_labels(caplog):
     '''
     Runs normalizer on ['Br1SiSiK'] expects error. Should replace the label with 'X' and
-    the numbers of postitions should not match the labels.
+    the numbers of positions should not match the labels.
     '''
     backend = parse_file(single_string_atom_labels)
     run_normalize(backend)