diff --git a/glymur/jp2box.py b/glymur/jp2box.py
index 4949752..c264b7b 100644
--- a/glymur/jp2box.py
+++ b/glymur/jp2box.py
@@ -636,79 +636,6 @@ class CompositingLayerHeaderBox(Jp2kBox):
         return box
 
 
-class JP2HeaderBox(Jp2kBox):
-    """Container for JP2 header box information.
-
-    Attributes
-    ----------
-    box_id : str
-        4-character identifier for the box.
-    length : int
-        length of the box in bytes.
-    offset : int
-        offset of the box from the start of the file.
-    longname : str
-        more verbose description of the box.
-    box : list
-        List of boxes contained in this superbox.
-    """
-    def __init__(self, length=0, offset=-1):
-        Jp2kBox.__init__(self, box_id='jp2h', longname='JP2 Header')
-        self.length = length
-        self.offset = offset
-        self.box = []
-
-    def __str__(self):
-        msg = Jp2kBox.__str__(self)
-        for box in self.box:
-            boxstr = str(box)
-
-            # Add indentation.
-            strs = [('\n    ' + x) for x in boxstr.split('\n')]
-            msg += ''.join(strs)
-        return msg
-
-    def write(self, fptr):
-        """Write a JP2 Header box to file.
-        """
-        # Write the contained boxes, then come back and write the length.
-        orig_pos = fptr.tell()
-        fptr.write(struct.pack('>I', 0))
-        fptr.write('jp2h'.encode())
-        for box in self.box:
-            box.write(fptr)
-
-        end_pos = fptr.tell()
-        fptr.seek(orig_pos)
-        fptr.write(struct.pack('>I', end_pos - orig_pos))
-        fptr.seek(end_pos)
-
-    @staticmethod
-    def parse(fptr, offset, length):
-        """Parse JPEG 2000 header box.
-
-        Parameters
-        ----------
-        fptr : file
-            Open file object.
-        offset : int
-            Start position of box in bytes.
-        length : int
-            Length of the box in bytes.
-
-        Returns
-        -------
-        JP2HeaderBox instance
-        """
-        box = JP2HeaderBox(length=length, offset=offset)
-
-        # The JP2 header box is a superbox, so go ahead and parse its child
-        # boxes.
-        box.box = box.parse_superbox(fptr)
-
-        return box
-
-
 class ComponentMappingBox(Jp2kBox):
     """Container for channel identification information.
 
diff --git a/glymur/jp2k.py b/glymur/jp2k.py
index 897d6a6..8dba499 100644
--- a/glymur/jp2k.py
+++ b/glymur/jp2k.py
@@ -188,8 +188,8 @@ class Jp2k(Jp2kBox):
                     warnings.warn(msg)
 
     def _validate_write_parameters(self, img_array, code_block_size,
-                                   precinct_sizes, cratios, psnr, mct,
-                                   colorspace, codec_fmt):
+                                   precinct_sizes, cratios, psnr, colorspace,
+                                   codec_fmt):
         """Check that the input parameters to the write function are valid.
 
         Parameters
@@ -362,7 +362,7 @@ class Jp2k(Jp2kBox):
             codec_fmt = _opj2.CODEC_J2K
 
         self._validate_write_parameters(img_array, cbsize, psizes, cratios,
-                                        psnr, mct, colorspace, codec_fmt)
+                                        psnr, colorspace, codec_fmt)
 
         cparams = _opj2.set_default_encoder_parameters()
 
diff --git a/glymur/lib/c.py b/glymur/lib/c.py
index 984adc5..4a51551 100644
--- a/glymur/lib/c.py
+++ b/glymur/lib/c.py
@@ -5,8 +5,8 @@ Wraps fopen and fclose functions in libc.
 import ctypes
 import ctypes.util
 
-libc_path = ctypes.util.find_library('c')
-C_LIB = ctypes.CDLL(libc_path)
+LIBC_PATH = ctypes.util.find_library('c')
+C_LIB = ctypes.CDLL(LIBC_PATH)
 
 
 def fopen(filename, mode):