diff --git a/Lib/email/utils.py b/Lib/email/utils.py
index a8e46a7..cfdfeb3 100644
--- a/Lib/email/utils.py
+++ b/Lib/email/utils.py
@@ -109,7 +109,7 @@ def formataddr(pair, charset='utf-8'):
 
 def getaddresses(fieldvalues):
     """Return a list of (REALNAME, EMAIL) for each fieldvalue."""
-    all = COMMASPACE.join(fieldvalues)
+    all = COMMASPACE.join(str(v) for v in fieldvalues)
     a = _AddressList(all)
     return a.addresslist
 
diff --git a/Lib/test/test_email/test_email.py b/Lib/test/test_email/test_email.py
index eed6014..0154bba 100644
--- a/Lib/test/test_email/test_email.py
+++ b/Lib/test/test_email/test_email.py
@@ -3263,6 +3263,11 @@ def test_getaddresses_embedded_comment(self):
         addrs = utils.getaddresses(['User ((nested comment)) <foo@bar.com>'])
         eq(addrs[0][1], 'foo@bar.com')
 
+    def test_getaddresses_header_obj(self):
+        """Test the handling of a Header object."""
+        addrs = utils.getaddresses([Header('Al Person <aperson@dom.ain>')])
+        self.assertEqual(addrs[0][1], 'aperson@dom.ain')
+
     def test_make_msgid_collisions(self):
         # Test make_msgid uniqueness, even with multiple threads
         class MsgidsThread(Thread):