diff --git a/enspara/ra/ra.py b/enspara/ra/ra.py
index 51d21a62c..4fcbff193 100644
--- a/enspara/ra/ra.py
+++ b/enspara/ra/ra.py
@@ -649,8 +649,12 @@ def __setitem__(self, iis, value):
             value = value._array
         # ints, slices, lists, and numpy objects are handled by numpy
         if isinstance(iis, (numbers.Integral, slice, list, np.ndarray)):
-            self._array[iis] = value
-            self.__init__(self._array)
+            if iis == slice(None, None, None):
+                self._data[iis] = value
+                self.__init__(self._data, lengths=self.lengths)
+            else:
+                self._array[iis] = value
+                self.__init__(self._array)
         # tuples get index conversion from 2d to 1d
         elif isinstance(iis, tuple):
             first_dimension, second_dimension = iis
diff --git a/enspara/test/test_ra.py b/enspara/test/test_ra.py
index 159dae835..cc787c711 100644
--- a/enspara/test/test_ra.py
+++ b/enspara/test/test_ra.py
@@ -400,6 +400,12 @@ def test_ra_operator_not_implemented(self):
         with assert_raises(TypeError):
             a > 'asdfasdfasd'
 
+    def test_ra_null_slice(self):
+        a = ra.RaggedArray(np.arange(15), lengths=[2,3,15])
+        a[:] = 22
+        assert np.all(a._data == np.ones(15, dtype=int)*22)
+
+
 
 class TestParallelLoad(unittest.TestCase):
 
@@ -663,7 +669,7 @@ def test_concat_atoms(self):
         trjlist = [md.load(self.top_fname)] * 10
         trj = concatenate_trjs(trjlist, atoms=ATOMS)
 
-        assert_equals(len(trjlist), len(trj))
+        assertEqual(len(trjlist), len(trj))
 
         for trjframe, trjlist_item in zip(trj, trjlist):
             sliced_item = trjlist_item.atom_slice(