diff --git a/music21/pitch.py b/music21/pitch.py
index 6e0782dec..740b032a8 100644
--- a/music21/pitch.py
+++ b/music21/pitch.py
@@ -4721,9 +4721,8 @@ def transpose(
             # set fundamental
             self.fundamental = p.fundamental
             self.spellingIsInferred = p.spellingIsInferred
-            # deepcopy _microtone if present (not thru microtone property to detect None)
-            if p._microtone is not None:
-                self._microtone = copy.deepcopy(p._microtone)
+            # deepcopy _microtone (not thru microtone property to detect None)
+            self._microtone = copy.deepcopy(p._microtone)
             return None
 
     # --------------------------------------------------------------------------
diff --git a/music21/test/test_pitch.py b/music21/test/test_pitch.py
index 81d1e7fcb..006e6dc8e 100644
--- a/music21/test/test_pitch.py
+++ b/music21/test/test_pitch.py
@@ -19,6 +19,7 @@
 from music21 import converter
 from music21 import corpus
 from music21 import editorial
+from music21 import interval
 from music21 import key
 from music21 import note
 from music21 import pitch
@@ -801,6 +802,12 @@ def testLowNotes(self):
         self.assertEqual(lowC.name, 'C')
         self.assertEqual(lowC.octave, -1)
 
+    def testTransposeInPlaceReplacesMicrotone(self):
+        p = Pitch('C4')
+        p.microtone = 50
+        p.transpose(interval.ChromaticInterval(0.5), inPlace=True)
+        self.assertEqual(str(p), 'C#4')
+
     def testQuarterToneA(self):
         p1 = Pitch('D#~')
         # environLocal.printDebug([p1, p1.accidental])