diff --git a/client/full/src/uds/tools.py b/client/full/src/uds/tools.py
index 72ffc535e..5c4b93ddd 100644
--- a/client/full/src/uds/tools.py
+++ b/client/full/src/uds/tools.py
@@ -72,7 +72,7 @@ nVgtClKcDDlSaBsO875WDR0CAwEAAQ==
 
 def saveTempFile(content, filename=None):
     if filename is None:
-        filename = b''.join(random.choice(string.ascii_lowercase + string.digits) for _ in range(16))
+        filename = ''.join(random.choice(string.ascii_lowercase + string.digits) for _ in range(16))
         filename = filename + '.uds'
 
     if 'win32' in sys.platform: