diff --git a/src/calibre/ebooks/conversion/utils.py b/src/calibre/ebooks/conversion/utils.py
index 4663eeccdf..6cdb688dff 100644
--- a/src/calibre/ebooks/conversion/utils.py
+++ b/src/calibre/ebooks/conversion/utils.py
@@ -54,7 +54,7 @@ class HeuristicProcessor(object):
         return '<'+styles+' style="page-break-before:always">'+chap
 
     def analyze_title_matches(self, match):
-        chap = match.group('chap')
+        #chap = match.group('chap')
         title = match.group('title')
         if not title:
             self.chapters_no_title = self.chapters_no_title + 1
@@ -136,7 +136,7 @@ class HeuristicProcessor(object):
             'nota bene', 'Nota bene', 'Ste.', 'Mme.', 'Mdme.',
             'Mlle.', 'Mons.', 'PS.', 'PPS.',
         ]
-        
+
         ITALICIZE_STYLE_PATS = [
             r'(?msu)(?<=\s)_(?P<words>\S[^_]{0,40}?\S)?_(?=\s)',
             r'(?msu)(?<=\s)/(?P<words>\S[^/]{0,40}?\S)?/(?=\s)',
@@ -150,7 +150,7 @@ class HeuristicProcessor(object):
             r'(?msu)(?<=\s)/:(?P<words>\S[^:/]{0,40}?\S)?:/(?=\s)',
             r'(?msu)(?<=\s)\|:(?P<words>\S[^:\|]{0,40}?\S)?:\|(?=\s)',
         ]
-        
+
         for word in ITALICIZE_WORDS:
             html = html.replace(word, '<i>%s</i>' % word)
 
@@ -242,7 +242,7 @@ class HeuristicProcessor(object):
                     lp_title = default_title
                 else:
                     lp_title = simple_title
-                 
+
                 if ignorecase:
                     arg_ignorecase = r'(?i)'
                 else:
@@ -250,7 +250,7 @@ class HeuristicProcessor(object):
 
                 if title_req:
                     lp_opt_title_open = ''
-                    lp_opt_title_close = ''        
+                    lp_opt_title_close = ''
                 else:
                     lp_opt_title_open = opt_title_open
                     lp_opt_title_close = opt_title_close
@@ -399,7 +399,7 @@ class HeuristicProcessor(object):
         if len(lines) > 1:
             self.log.debug("There are " + unicode(len(blanklines)) + " blank lines. " +
                     unicode(float(len(blanklines)) / float(len(lines))) + " percent blank")
-                    
+
             if float(len(blanklines)) / float(len(lines)) > 0.40:
                 return True
             else:
@@ -460,7 +460,7 @@ class HeuristicProcessor(object):
         if getattr(self.extra_opts, 'markup_chapter_headings', False):
             html = self.markup_chapters(html, self.totalwords, blanks_between_paragraphs)
 
-        if getattr(self.extra_opts, 'italicize_common_cases', False): 
+        if getattr(self.extra_opts, 'italicize_common_cases', False):
             html = self.markup_italicis(html)
 
         # If more than 40% of the lines are empty paragraphs and the user has enabled delete
@@ -487,7 +487,7 @@ class HeuristicProcessor(object):
         unwrap_factor = getattr(self.extra_opts, 'html_unwrap_factor', 0.4)
         length = docanalysis.line_length(unwrap_factor)
         self.log.debug("Median line length is " + unicode(length) + ", calculated with " + format + " format")
-            
+
         ###### Unwrap lines ######
         if getattr(self.extra_opts, 'unwrap_lines', False):
             # only go through unwrapping code if the histogram shows unwrapping is required or if the user decreased the default unwrap_factor
diff --git a/src/calibre/ebooks/lit/input.py b/src/calibre/ebooks/lit/input.py
index ff8955939e..ff901c3715 100644
--- a/src/calibre/ebooks/lit/input.py
+++ b/src/calibre/ebooks/lit/input.py
@@ -7,8 +7,6 @@ __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
 
 from calibre.customize.conversion import InputFormatPlugin
-from calibre.ebooks.conversion.utils import HeuristicProcessor
-
 
 class LITInput(InputFormatPlugin):
 
diff --git a/src/calibre/ebooks/mobi/input.py b/src/calibre/ebooks/mobi/input.py
index 8188027e01..4ce3618441 100644
--- a/src/calibre/ebooks/mobi/input.py
+++ b/src/calibre/ebooks/mobi/input.py
@@ -3,7 +3,6 @@ __license__ = 'GPL 3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
 
-import re
 from calibre.customize.conversion import InputFormatPlugin
 
 class MOBIInput(InputFormatPlugin):