diff --git a/maya/core.py b/maya/core.py
index a7db620..ae12523 100644
--- a/maya/core.py
+++ b/maya/core.py
@@ -352,7 +352,7 @@ class MayaInterval(object):
 
     def iso8601(self):
         """Returns an ISO 8601 representation of the MayaInterval."""
-        return '{0}/{1}'.format(self.start.iso6801, self.end.iso8601)
+        return '{0}/{1}'.format(self.start.iso8601(), self.end.iso8601())
 
     @classmethod
     def from_iso8601(cls, s):
diff --git a/tests/test_maya_interval.py b/tests/test_maya_interval.py
index dcaf3b0..6325ef5 100755
--- a/tests/test_maya_interval.py
+++ b/tests/test_maya_interval.py
@@ -582,3 +582,9 @@ def test_interval_from_datetime():
     )
     assert interval3.start == start
     assert interval3.end == end
+
+
+def test_interval_iso8601():
+    start = maya.when('11-17-11 08:09:10')
+    interval = maya.MayaInterval(start=start, duration=1)
+    assert interval.iso8601() == '2011-11-17T08:09:10Z/2011-11-17T08:09:11Z'