diff --git a/nifty/operators/fft_operator/transformations/rg_transforms.py b/nifty/operators/fft_operator/transformations/rg_transforms.py
index 9b4866420223f52cbe82549e7894596bfa2f1049..4ae16500976ed61b7414d1f8369966b2194c4c77 100644
--- a/nifty/operators/fft_operator/transformations/rg_transforms.py
+++ b/nifty/operators/fft_operator/transformations/rg_transforms.py
@@ -373,6 +373,10 @@ class MPIFFT(Transform):
                 original_shape = inp.shape
                 inp = inp.reshape(inp.shape[0], 1)
                 axes = (0, )
+                if original_shape[0]%2!=0:
+                    raise AttributeError("MPI-FFTs of onedimensional arrays "
+                        "with odd length are currently not supported due to a "
+                        "bug in FFTW. Please use a grid with even length.")
 
             if current_info is None:
                 transform_shape = list(inp.shape)
diff --git a/test/test_operators/test_fft_operator.py b/test/test_operators/test_fft_operator.py
index 2f31c3272e230f967f995dfa7de3dc8df85546d0..18bb5c7f52e94a35cbc76ab52b482db6e627b76f 100644
--- a/test/test_operators/test_fft_operator.py
+++ b/test/test_operators/test_fft_operator.py
@@ -63,7 +63,7 @@ class FFTOperatorTests(unittest.TestCase):
         assert_equal(res[zc1 * (dim1 // 2), zc2 * (dim2 // 2)], 0.)
 
     @expand(product(["numpy", "fftw", "fftw_mpi"],
-                    [10, 11], [False, True], [False, True],
+                    [12, ], [False, True], [False, True],
                     [0.1, 1, 3.7],
                     [np.float64, np.complex128, np.float32, np.complex64]))
     def test_fft1D(self, module, dim1, zc1, zc2, d, itp):
@@ -86,7 +86,7 @@ class FFTOperatorTests(unittest.TestCase):
                         rtol=tol, atol=tol)
 
     @expand(product(["numpy", "fftw", "fftw_mpi"],
-                    [10, 11], [9, 12], [False, True],
+                    [12, 15], [9, 12], [False, True],
                     [False, True], [False, True], [False, True], [0.1, 1, 3.7],
                     [0.4, 1, 2.7],
                     [np.float64, np.complex128, np.float32, np.complex64]))
diff --git a/test/test_serialization.py b/test/test_serialization.py
index 27be6fbc243819534a5c4330efdaa29ece76b55c..48fa1bc12f4f9366ce70bc043293ddac8567ea1a 100644
--- a/test/test_serialization.py
+++ b/test/test_serialization.py
@@ -39,4 +39,7 @@ class SpaceSerializationTests(unittest.TestCase):
         repo.commit()
         assert_equal(space, repo.get('space'))
         assert_equal(field, repo.get('field'))
-        os.remove('test.h5')
+        try:
+            os.remove('test.h5')
+        except OSError:
+            pass