diff --git a/testing/python/approx.py b/testing/python/approx.py
index 6fff32c85..5064e2a85 100644
--- a/testing/python/approx.py
+++ b/testing/python/approx.py
@@ -348,7 +348,7 @@ class TestApprox:
 
     def test_hash(self):
         assert {1} == {approx(1, rel=1e-6, abs=1e-12)}
-        assert {1+1e-5} != {approx(1, rel=1e-6, abs=1e-12)}
+        assert {1 + 1e-5} != {approx(1, rel=1e-6, abs=1e-12)}
 
     def test_exactly_equal(self):
         examples = [