diff --git a/maya.py b/maya.py
index 155098b..f2cffd2 100644
--- a/maya.py
+++ b/maya.py
@@ -476,7 +476,7 @@ class MayaInterval(object):
         if isinstance(item, MayaDT):
             return self.contains_dt(item)
 
-        return item.contains(self)
+        return self.contains(item)
 
     def contains_dt(self, dt):
         return self.start <= dt < self.end
diff --git a/test_maya_interval.py b/test_maya_interval.py
index 0cd1623..eecbfd8 100755
--- a/test_maya_interval.py
+++ b/test_maya_interval.py
@@ -187,7 +187,7 @@ def test_interval_contains(
     )
 
     assert interval1.contains(interval2) is expected
-    assert (interval1 in interval2) is expected
+    assert (interval2 in interval1) is expected
 
 
 @pytest.mark.parametrize('start_doy,end_doy,dt_doy,expected', (