diff --git a/nitime/tests/test_timeseries.py b/nitime/tests/test_timeseries.py
index 7aaeac93..80ee8a9e 100644
--- a/nitime/tests/test_timeseries.py
+++ b/nitime/tests/test_timeseries.py
@@ -925,7 +925,11 @@ def test_timearray_math_functions():
             npt.assert_(getattr(b, f)().__class__ == ts.TimeArray)
             npt.assert_(getattr(b, f)().time_unit == b.time_unit)
             # comparison with unitless should convert to the TimeArray's units
-            npt.assert_(getattr(b, f)() == getattr(a, f)())
+            if f == "ptp":
+                want = np.ptp(a)  # ndarray.ptp removed in 2.0
+            else:
+                want = getattr(a, f)()
+            npt.assert_(getattr(b, f)() == want)
 
 
 def test_timearray_var_prod():
diff --git a/nitime/timeseries.py b/nitime/timeseries.py
index 4fd44a92..e36708c4 100644
--- a/nitime/timeseries.py
+++ b/nitime/timeseries.py
@@ -152,7 +152,7 @@ class instance, or an int64 array in the base unit of the module
                 e_s += 'TimeArray in object, or int64 times, in %s' % base_unit
                 raise ValueError(e_s)
 
-            time = np.array(data, copy=False)
+            time = np.asarray(data)
         else:
             if isinstance(data, TimeInterface):
                 time = data.copy()
@@ -309,7 +309,7 @@ def mean(self, *args, **kwargs):
         return ret
 
     def ptp(self, *args, **kwargs):
-        ret = TimeArray(np.ndarray.ptp(self, *args, **kwargs),
+        ret = TimeArray(np.ptp(self, *args, **kwargs),
                         time_unit=base_unit)
         ret.convert_unit(self.time_unit)
         return ret