diff --git a/Lib/ctypes/test/test_array_in_pointer.py b/Lib/ctypes/test/test_array_in_pointer.py
index 3ed310cc684..0b46fb98c17 100644
--- a/Lib/ctypes/test/test_array_in_pointer.py
+++ b/Lib/ctypes/test/test_array_in_pointer.py
@@ -6,7 +6,7 @@ import re
 def dump(obj):
     # helper function to dump memory contents in hex, with a hyphen
     # between the bytes.
-    h = hexlify(buffer(obj))
+    h = str(hexlify(buffer(obj)))
     return re.sub(r"(..)", r"\1-", h)[:-1]