diff --git a/.travis.yml b/.travis.yml
index 623c6e1..0e9c7e7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,6 @@ python:
   - "3.4"
   - "3.3"
   - "2.7"
-  - "2.6"
 install:
   - sudo apt-get install zlib1g-dev
   - sudo ln -s /usr/lib/i386-linux-gnu/libz.so /usr/lib
diff --git a/glue/bin.py b/glue/bin.py
index fe2c4c8..60ee6df 100755
--- a/glue/bin.py
+++ b/glue/bin.py
@@ -154,12 +154,12 @@ def add_deprecated_argument(*args, **kwargs):
     extra = 0
     # Get the source from the source option or the first positional argument
     if not options.source and args:
-        options.source = args[0]
+        options.source = unicode(args[0])
         extra += 1
 
     # Get the output from the output option or the second positional argument
     if not options.output and args[extra:]:
-        options.output = args[extra]
+        options.output = unicode(args[extra])
 
     # Check if source is available
     if options.source is None:
diff --git a/glue/core.py b/glue/core.py
index 52b9315..e2914b8 100644
--- a/glue/core.py
+++ b/glue/core.py
@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 import re
 import os
 import sys
@@ -5,6 +6,7 @@
 import hashlib
 import StringIO
 import ConfigParser
+import unicodedata
 
 from PIL import Image as PILImage
 
@@ -48,7 +50,7 @@ def __init__(self, path, config):
         with open(self.path, "rb") as img:
             self._image_data = img.read()
 
-        print "\t{0} added to sprite".format(self.filename)
+        print u"\t{0} added to sprite".format(self.filename)
 
     @cached_property
     def image(self):
@@ -225,7 +227,7 @@ def hash(self):
             hash_list.append(value)
 
         if sys.version < '3':
-            return hashlib.sha1(''.join(map(str, hash_list))).hexdigest()[:10]
+            return hashlib.sha1(''.join([h.encode('utf-8') if isinstance(h, unicode) else str(h) for h in hash_list])).hexdigest()[:10]
         return hashlib.sha1(''.join(map(str, hash_list)).encode('utf-8')).hexdigest()[:10]
 
     @cached_property
@@ -258,11 +260,12 @@ def _locate_images(self):
         """
         extensions = '|'.join(self.valid_extensions)
         extension_re = re.compile('.+\.(%s)$' % extensions, re.IGNORECASE)
-        files = sorted(os.listdir(self.path))
 
         images = []
         for root, dirs, files in os.walk(self.path, followlinks=self.config['follow_links']):
             for filename in sorted(files):
+                # normalize different unicode representations, see https://stackoverflow.com/a/33647372/193886
+                filename = unicodedata.normalize('NFC', filename)
                 if not filename.startswith('.') and extension_re.match(filename):
                     images.append(Image(path=os.path.join(root, filename), config=self.config))
             if not self.config['recursive']:
diff --git a/glue/formats/css.py b/glue/formats/css.py
index ecb7177..15adbc1 100644
--- a/glue/formats/css.py
+++ b/glue/formats/css.py
@@ -182,7 +182,7 @@ def apply_cachebuster(path):
     def generate_css_name(self, filename):
         filename = filename.rsplit('.', 1)[0]
         separator = self.sprite.config['css_separator']
-        namespace = [re.sub(r'[^\w\-_]', '', filename)]
+        namespace = [re.sub(r'[^\w\-_]', '', filename, flags=re.UNICODE)]
 
         # Add sprite namespace if required
         if self.sprite.config['css_sprite_namespace']:
diff --git a/glue/managers/watch.py b/glue/managers/watch.py
index 51875eb..ca600c5 100644
--- a/glue/managers/watch.py
+++ b/glue/managers/watch.py
@@ -3,6 +3,7 @@
 import time
 import signal
 import hashlib
+import unicodedata
 
 
 class WatchManager(object):
@@ -29,6 +30,7 @@ def generate_hash(self):
         hash_list = []
         for root, dirs, files in os.walk(self.options['source']):
             for f in sorted([f for f in files if not f.startswith('.')]):
+                f = unicodedata.normalize('NFC', f)
                 hash_list.append(os.path.join(root, f))
                 hash_list.append(str(os.path.getmtime(os.path.join(root, f))))
         hash_list = ''.join(hash_list)
diff --git a/tests.py b/tests.py
index 556ec5a..3109bed 100644
--- a/tests.py
+++ b/tests.py
@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 import os
 import sys
 import json
@@ -205,6 +206,31 @@ def test_output(self):
                         u'width': u'64px',
                         u'height': u'64px'})
 
+    def test_unicode_input_output(self):
+        self.create_image(u"simple/redöåä.png", RED)
+        self.create_image(u"simple/blueöåä.png", BLUE)
+        code = self.call("glue simple output")
+        self.assertEqual(code, 0)
+
+        self.assertExists("output/simple.png")
+        self.assertExists("output/simple.css")
+        self.assertColor("output/simple.png", RED, ((0, 0), (63, 63)))
+        self.assertColor("output/simple.png", BLUE, ((64, 0), (127, 63)))
+
+        self.assertCSS(u"output/simple.css", u'.sprite-simple-redöåä',
+                       {u'background-image': u"url(simple.png)",
+                        u'background-repeat': u'no-repeat',
+                        u'background-position': u'0 0',
+                        u'width': u'64px',
+                        u'height': u'64px'})
+
+        self.assertCSS(u"output/simple.css", u'.sprite-simple-blueöåä',
+                       {u'background-image': u"url(simple.png)",
+                        u'background-repeat': u'no-repeat',
+                        u'background-position': u'-64px 0',
+                        u'width': u'64px',
+                        u'height': u'64px'})
+
     def test_quiet(self):
         self.create_image("simple/red.png", RED)
         self.create_image("simple/blue.png", BLUE)
@@ -1801,5 +1827,6 @@ def test_caat_ratios(self):
             data = json.loads(f.read())
             assert isinstance(data['sprites'], dict)
 
+
 if __name__ == '__main__':
     unittest.main()