diff --git a/tests/nbackend/test_extensions.py b/tests/nbackend/test_extensions.py
index 75726a3512b1291531ecf73a61af22258d17003c..86b9f0632ea2f9129164d9bde269d2767d06ea6a 100644
--- a/tests/nbackend/test_extensions.py
+++ b/tests/nbackend/test_extensions.py
@@ -54,6 +54,6 @@ def test_literals():
     print(code)
 
     assert "const double x = C;" in code
-    assert "CELLS[0]" in code
-    assert "CELLS[1]" in code
-    assert "CELLS[2]" in code
+    assert "CELLS[0l]" in code
+    assert "CELLS[1l]" in code
+    assert "CELLS[2l]" in code