diff --git a/pysptk/__init__.py b/pysptk/__init__.py
index 3c5c790..bc1f1da 100644
--- a/pysptk/__init__.py
+++ b/pysptk/__init__.py
@@ -1,5 +1,3 @@
-# coding: utf-8
-
 """
 A python wrapper for `Speech Signal Processing Toolkit (SPTK)
 <http://sp-tk.sourceforge.net>`_.
diff --git a/pysptk/_sptk.pyx b/pysptk/_sptk.pyx
index a7bd0bf..a91ad11 100644
--- a/pysptk/_sptk.pyx
+++ b/pysptk/_sptk.pyx
@@ -1,4 +1,3 @@
-# coding: utf-8
 # cython: boundscheck=True, wraparound=True
 
 import numpy as np
diff --git a/pysptk/conversion.py b/pysptk/conversion.py
index ebefb97..2ddef04 100644
--- a/pysptk/conversion.py
+++ b/pysptk/conversion.py
@@ -1,5 +1,3 @@
-# coding: utf-8
-
 """
 Other conversions
 -----------------