diff --git a/src/tools21cm/gaussian_random_field.py b/src/tools21cm/gaussian_random_field.py
index f04ee2e..cc11b74 100644
--- a/src/tools21cm/gaussian_random_field.py
+++ b/src/tools21cm/gaussian_random_field.py
@@ -62,7 +62,7 @@ def make_gaussian_random_field(dims, box_dims, power_spectrum, random_seed=None)
     return map_real
 
 
-def make_gaussian_random_field_like_field(input_field, box_dims, random_seed=None):
+def make_gaussian_random_field_like_field(input_field, box_dims, kbins=10, random_seed=None):
     '''
     Generate a Gaussian random field with the same power spectrum as the
     input field.
@@ -71,6 +71,7 @@ def make_gaussian_random_field_like_field(input_field, box_dims, random_seed=Non
         * input_field (numpy array): The field to take the power spectrum
             from
         * box_dims (float or tuple): The dimensions of the input_field in cMpc
+        * kbins (int): The number of bins in k-space
         * random_seed (int): the seed for the random number generation
         
     Returns:
@@ -82,18 +83,18 @@ def make_gaussian_random_field_like_field(input_field, box_dims, random_seed=Non
         at low k. Use with care.
     '''
     
-    ps_k = _get_ps_func_for_field(input_field, box_dims)
+    ps_k = _get_ps_func_for_field(input_field, box_dims, kbins=kbins)
     random_field = make_gaussian_random_field(input_field.shape, box_dims, \
                                         power_spectrum=ps_k, random_seed=random_seed)
     return random_field
     
     
-def _get_ps_func_for_field(input_field, box_dims):
+def _get_ps_func_for_field(input_field, box_dims, kbins=10):
     '''
     Return ps(k) for the specified field. For internal use.
     '''
     ps_input, k_input, n_modes = power_spectrum_1d(input_field, \
-                            box_dims=box_dims, kbins=10, return_n_modes=True)
+                            box_dims=box_dims, kbins=kbins, return_n_modes=True)
     ps_k = interp1d(k_input[n_modes>0], ps_input[n_modes>0], kind='linear', \
                     bounds_error=False, fill_value=0.)
     return ps_k