diff --git a/conftest.py b/conftest.py
new file mode 100644
index 0000000..5729d8d
--- /dev/null
+++ b/conftest.py
@@ -0,0 +1,2 @@
+# used by pytest to test against the local copy of dominate
+# (this file is important even though it is empty)
diff --git a/dominate/dom_tag.py b/dominate/dom_tag.py
index 88b4716..50ac5e1 100644
--- a/dominate/dom_tag.py
+++ b/dominate/dom_tag.py
@@ -401,7 +401,8 @@ def clean_attribute(attribute):
       attribute = attribute[1:]
 
     # Workaround for dash
-    if attribute in set(['http_equiv']) or attribute.startswith('data_'):
+    special_prefix = any([attribute.startswith(x) for x in ('data_', 'aria_')])
+    if attribute in set(['http_equiv']) or special_prefix:
       attribute = attribute.replace('_', '-').lower()
 
     # Workaround for colon
diff --git a/tests/test_html.py b/tests/test_html.py
index f71f8e4..dff9aa2 100644
--- a/tests/test_html.py
+++ b/tests/test_html.py
@@ -208,6 +208,12 @@ def test_attributes():
     attr(id='moo')
 
 
+def test_attribute_dashes():
+  # fix issue #118 (https://github.com/Knio/dominate/issues/118)
+  expected = '<div aria-foo="bar" data-a-b-c="foo" data-page-size="123"></div>'
+  assert div(data_a_b_c='foo', data_page_size='123', aria_foo='bar').render() == expected
+
+
 def test_lazy():
   from dominate import util
   executed = [False]