diff --git a/test/test_operators/test_representation.py b/test/test_operators/test_representation.py
index 5235413bf4885f215935a1be9e27cb793243e532..3afcd34b7a00b6e31ede4a53150e57ebdb626172 100644
--- a/test/test_operators/test_representation.py
+++ b/test/test_operators/test_representation.py
@@ -57,8 +57,8 @@ def testOperatorCombinations(sp, dtype):
     b = ift.DiagonalOperator(ift.Field.from_random("normal", sp, dtype=dtype))
     _check_repr(ift.SandwichOperator.make(a, b))
     _check_repr(a(b))
-    _check_repr(a + b)
-    _check_repr(a - b)
+    _check_repr(a+b)
+    _check_repr(a-b)
     _check_repr(a*b)
     _check_repr(a**2)