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-rw-r--r--tests/image-fuzzer/qcow2/layout.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/tests/image-fuzzer/qcow2/layout.py b/tests/image-fuzzer/qcow2/layout.py
index c57418fa15..fe273d4143 100644
--- a/tests/image-fuzzer/qcow2/layout.py
+++ b/tests/image-fuzzer/qcow2/layout.py
@@ -518,7 +518,7 @@ class Image(object):
         rounded = (size + self.cluster_size - 1) & ~(self.cluster_size - 1)
         if rounded > size:
             image_file.seek(rounded - 1)
-            image_file.write("\0")
+            image_file.write(b'\x00')
         image_file.close()
 
     @staticmethod