diff --git a/sass.py b/sass.py
index e9b56040..758de34d 100644
--- a/sass.py
+++ b/sass.py
@@ -15,7 +15,7 @@
 import collections
 import functools
 import inspect
-from io import open
+import io
 import os
 import os.path
 import re
@@ -236,8 +236,9 @@ def compile_dirname(
             if s:
                 v = v.decode('UTF-8')
                 mkdirp(os.path.dirname(output_filename))
-                with open(output_filename, 'w',
-                          encoding="UTF-8") as output_file:
+                with io.open(
+                    output_filename, 'w', encoding='UTF-8', newline='',
+                ) as output_file:
                     output_file.write(v)
             else:
                 return False, v
diff --git a/sassc.py b/sassc.py
index 24fe5265..5d6d578f 100755
--- a/sassc.py
+++ b/sassc.py
@@ -179,13 +179,15 @@ def main(argv=sys.argv, stdout=sys.stdout, stderr=sys.stderr):
             if len(args) < 2:
                 print(css, file=stdout)
             else:
-                with io.open(args[1], 'w', encoding='utf-8') as f:
+                with io.open(args[1], 'w', encoding='utf-8', newline='') as f:
                     f.write(css)
                 if options.watch:
                     print(filename, 'is just compiled to', args[1],
                           file=stdout)
             if source_map_filename:
-                with io.open(source_map_filename, 'w', encoding='utf-8') as f:
+                with io.open(
+                    source_map_filename, 'w', encoding='utf-8', newline='',
+                ) as f:
                     f.write(source_map)
         if options.watch:  # pragma: no cover
             # FIXME: we should utilize inotify on Linux, and FSEvents on Mac
diff --git a/sasstests.py b/sasstests.py
index 7a91338c..2558913f 100644
--- a/sasstests.py
+++ b/sasstests.py
@@ -643,25 +643,20 @@ def test_wsgi_sass_middleware(self):
             client = Client(app, Response)
             r = client.get('/asdf')
             assert r.status_code == 200
-            self.assert_bytes_equal(b'/asdf', r.data)
+            self.assertEqual(b'/asdf', r.data)
             assert r.mimetype == 'text/plain'
             r = client.get('/static/a.scss.css')
             assert r.status_code == 200
-            self.assert_bytes_equal(
+            self.assertEqual(
                 b(A_EXPECTED_CSS_WITH_MAP),
-                r.data
+                r.data,
             )
             assert r.mimetype == 'text/css'
             r = client.get('/static/not-exists.sass.css')
             assert r.status_code == 200
-            self.assert_bytes_equal(b'/static/not-exists.sass.css', r.data)
+            self.assertEqual(b'/static/not-exists.sass.css', r.data)
             assert r.mimetype == 'text/plain'
 
-    def assert_bytes_equal(self, expected, actual, *args):
-        self.assertEqual(expected.replace(b'\r\n', b'\n'),
-                         actual.replace(b'\r\n', b'\n'),
-                         *args)
-
 
 class DistutilsTestCase(BaseTestCase):
 
@@ -749,7 +744,7 @@ def test_sassc_output(self):
             assert exit_code == 0
             assert self.err.getvalue() == ''
             assert self.out.getvalue() == ''
-            with open(tmp) as f:
+            with io.open(tmp, encoding='UTF-8', newline='') as f:
                 assert A_EXPECTED_CSS.strip() == f.read().strip()
         finally:
             os.remove(tmp)
diff --git a/sassutils/builder.py b/sassutils/builder.py
index e525f0e1..76d3719d 100644
--- a/sassutils/builder.py
+++ b/sassutils/builder.py
@@ -61,7 +61,9 @@ def build_directory(sass_path, css_path, output_style='nested',
             css = compile(filename=sass_fullname,
                           output_style=output_style,
                           include_paths=[_root_sass])
-            with io.open(css_fullname, 'w', encoding='utf-8') as css_file:
+            with io.open(
+                css_fullname, 'w', encoding='utf-8', newline='',
+            ) as css_file:
                 css_file.write(css)
             result[os.path.relpath(sass_fullname, _root_sass)] = \
                 os.path.relpath(css_fullname, _root_css)
@@ -215,10 +217,12 @@ def build_one(self, package_dir, filename, source_map=False):
         css_folder = os.path.dirname(css_path)
         if not os.path.exists(css_folder):
             os.makedirs(css_folder)
-        with io.open(css_path, 'w', encoding='utf-8') as f:
+        with io.open(css_path, 'w', encoding='utf-8', newline='') as f:
             f.write(css)
         if source_map:
             # Source maps are JSON, and JSON has to be UTF-8 encoded
-            with io.open(source_map_path, 'w', encoding='utf-8') as f:
+            with io.open(
+                source_map_path, 'w', encoding='utf-8', newline='',
+            ) as f:
                 f.write(source_map)
         return css_filename