diff --git a/tests/test_build_html.py b/tests/test_build_html.py
index 41ebf0556..5f4dea0ff 100644
--- a/tests/test_build_html.py
+++ b/tests/test_build_html.py
@@ -11,7 +11,6 @@
 
 import os
 import re
-import difflib
 import htmlentitydefs
 from StringIO import StringIO
 
@@ -285,8 +284,8 @@ def test_html(app):
     html_warnings_exp = HTML_WARNINGS % {'root': re.escape(app.srcdir)}
     assert re.match(html_warnings_exp + '$', html_warnings), \
            'Warnings don\'t match:\n' + \
-           '\n'.join(difflib.ndiff(html_warnings_exp.splitlines(),
-                                   html_warnings.splitlines()))
+           '--- Expected (regex):\n' + html_warnings_exp + \
+           '--- Got:\n' + html_warnings
 
     for fname, paths in HTML_XPATH.iteritems():
         parser = NslessParser()
diff --git a/tests/test_build_latex.py b/tests/test_build_latex.py
index 6a20746b6..4405395a0 100644
--- a/tests/test_build_latex.py
+++ b/tests/test_build_latex.py
@@ -12,7 +12,6 @@
 import os
 import re
 import sys
-import difflib
 from StringIO import StringIO
 from subprocess import Popen, PIPE
 
@@ -42,8 +41,9 @@ def test_latex(app):
     latex_warnings_exp = LATEX_WARNINGS % {'root': app.srcdir}
     assert re.match(latex_warnings_exp + '$', latex_warnings), \
            'Warnings don\'t match:\n' + \
-           '\n'.join(difflib.ndiff(latex_warnings_exp.splitlines(),
-                                   latex_warnings.splitlines()))
+           '--- Expected (regex):\n' + latex_warnings_exp + \
+           '--- Got:\n' + latex_warnings
+
     # file from latex_additional_files
     assert (app.outdir / 'svgimg.svg').isfile()