diff --git a/pyqtgraph/parametertree/Parameter.py b/pyqtgraph/parametertree/Parameter.py
index 2d830273..c084634a 100644
--- a/pyqtgraph/parametertree/Parameter.py
+++ b/pyqtgraph/parametertree/Parameter.py
@@ -201,6 +201,7 @@ class Parameter(QtCore.QObject):
 
         if 'default' not in self.opts:
             self.opts['default'] = None
+            self.setDefault(self.opts['value'])
     
         ## Connect all state changed signals to the general sigStateChanged
         self.sigValueChanged.connect(self._emitValueChanged)
diff --git a/pyqtgraph/parametertree/tests/test_Parameter.py b/pyqtgraph/parametertree/tests/test_Parameter.py
index 70feab5f..e0c5a985 100644
--- a/pyqtgraph/parametertree/tests/test_Parameter.py
+++ b/pyqtgraph/parametertree/tests/test_Parameter.py
@@ -8,32 +8,23 @@ def test_parameter_hasdefault():
 
     # default unspecified
     p = Parameter(**opts)
-    assert not p.hasDefault()
-
-    p.setDefault(1)
     assert p.hasDefault()
-    assert p.defaultValue() == 1
+    assert p.defaultValue() == opts["value"]
+
+    p.setDefault(2)
+    assert p.hasDefault()
+    assert p.defaultValue() == 2
 
     # default specified
     p = Parameter(default=0, **opts)
     assert p.hasDefault()
     assert p.defaultValue() == 0
 
-
-@pytest.mark.parametrize('passdefault', [True, False])
-def test_parameter_hasdefault_none(passdefault):
-    # test that Parameter essentially ignores defualt=None, same as not passing
-    # a default at all
-    opts = {'name': 'param', 'type': int, 'value': 0}
-    if passdefault:
-        opts['default'] = None
-
-    p = Parameter(**opts)
+    # default specified as None
+    p = Parameter(default=None, **opts)
     assert not p.hasDefault()
-    assert p.defaultValue() is None
 
-    p.setDefault(None)
-    assert not p.hasDefault()
+
 
 def test_unpack_parameter():
     # test that **unpacking correctly returns child name/value maps