diff --git a/nltools/stats.py b/nltools/stats.py
index fec0415c..bfad0007 100644
--- a/nltools/stats.py
+++ b/nltools/stats.py
@@ -821,7 +821,7 @@ def make_cosine_basis(nsamples, sampling_freq, filter_length, unit_scale=True, d
     """
 
     # Figure out number of basis functions to create
-    order = int(np.fix(2 * (nsamples * sampling_freq) / filter_length + 1))
+    order = int(np.trunc(2 * (nsamples * sampling_freq) / filter_length + 1))
 
     n = np.arange(nsamples)