diff --git a/nifty5/__init__.py b/nifty5/__init__.py
index 07ed65faad56feacda7f59a49d52bb85b65607d7..173c2ea4df270218a767fbd8ad2236467b1c7c47 100644
--- a/nifty5/__init__.py
+++ b/nifty5/__init__.py
@@ -46,7 +46,7 @@ from .operators.outer_product_operator import OuterProduct
 from .operators.simple_linear_operators import (
     VdotOperator, ConjugationOperator, Realizer,
     FieldAdapter, ducktape, GeometryRemover, NullOperator,
-    MatrixProductOperator)
+    MatrixProductOperator, PartialExtractor)
 from .operators.value_inserter import ValueInserter
 from .operators.energy_operators import (
     EnergyOperator, GaussianEnergy, PoissonianEnergy, InverseGammaLikelihood,
diff --git a/nifty5/operators/simple_linear_operators.py b/nifty5/operators/simple_linear_operators.py
index 80905fbfb395930367f8af57d042939b692340ec..2e161f3da2ff867082f548034da6a67514ac9021 100644
--- a/nifty5/operators/simple_linear_operators.py
+++ b/nifty5/operators/simple_linear_operators.py
@@ -326,7 +326,7 @@ class NullOperator(LinearOperator):
         return self._nullfield(self._tgt(mode))
 
 
-class _PartialExtractor(LinearOperator):
+class PartialExtractor(LinearOperator):
     def __init__(self, domain, target):
         if not isinstance(domain, MultiDomain):
             raise TypeError("MultiDomain expected")