diff --git a/fastpm/core.py b/fastpm/core.py
index 5159bc0..7628f1e 100644
--- a/fastpm/core.py
+++ b/fastpm/core.py
@@ -110,8 +110,8 @@ def __init__(self, pm, cosmology, B=1, a_linear=1.0):
     def nbodystep(self):
         return FastPMStep(self)
 
-    def whitenoise(self, seed, unitary=False):
-        return self.pm.generate_whitenoise(seed, type='complex', unitary=unitary)
+    def whitenoise(self, seed, unitary=False, invertphase=False):
+        return self.pm.generate_whitenoise(seed, type='complex', unitary=unitary, invertphase=False)
 
     def linear(self, whitenoise, Pk):
         return whitenoise.apply(lambda k, v: