diff --git a/kwant/tests/test_operator.py b/kwant/tests/test_operator.py
index 02ee61f565d78df258a0eca9dff4ec18005068ce..e6f36d040d25b8faac1a4c78bebc857a98eb2df6 100644
--- a/kwant/tests/test_operator.py
+++ b/kwant/tests/test_operator.py
@@ -142,7 +142,6 @@ def test_operator_construction():
 def _test(A, bra, ket=None, per_el_val=None, reduced_val=None, args=()):
     if per_el_val is not None:
         val = A(bra, ket, args=args)
-        print(A.sum)
         assert np.allclose(val, per_el_val)
         # with bound args
         val = A.bind(args)(bra, ket)