1 files changed, 2 insertions, 0 deletions
diff --git a/Lib/sunau.py b/Lib/sunau.py
index 1880a01d1a..3c244925d1 100644
--- a/Lib/sunau.py
+++ b/Lib/sunau.py
@@ -415,6 +415,8 @@ class Au_write:
         return self._nframeswritten
 
     def writeframesraw(self, data):
+        if not isinstance(data, (bytes, bytearray)):
+            data = memoryview(data).cast('B')
         self._ensure_header_written()
         if self._comptype == 'ULAW':
             import audioop