diff --git a/furl/furl.py b/furl/furl.py
index cd6d710..64f1a2c 100644
--- a/furl/furl.py
+++ b/furl/furl.py
@@ -1407,8 +1407,6 @@ def load(self, url):
 
         self.netloc = tokens.netloc  # Raises ValueError in Python 2.7+.
         self.scheme = tokens.scheme
-        if not self.port:
-            self._port = DEFAULT_PORTS.get(self.scheme)
         self.path.load(tokens.path)
         self.query.load(tokens.query)
         self.fragment.load(tokens.fragment)
@@ -1469,7 +1467,7 @@ def port(self, port):
         Raises: ValueError on invalid port.
         """
         if port is None:
-            self._port = DEFAULT_PORTS.get(self.scheme)
+            self._port = None
         elif is_valid_port(port):
             self._port = int(str(port))
         else:
diff --git a/tests/test_furl.py b/tests/test_furl.py
index bc268c8..a411219 100644
--- a/tests/test_furl.py
+++ b/tests/test_furl.py
@@ -1511,7 +1511,7 @@ def test_basic_manipulation(self):
         assert str(f) == 'http://www.yahoo.com/?foo=eep'
 
         f.scheme = 'sup'
-        assert str(f) == 'sup://www.yahoo.com:80/?foo=eep'
+        assert str(f) == 'sup://www.yahoo.com/?foo=eep'
 
         f.port = None
         assert str(f) == 'sup://www.yahoo.com/?foo=eep'