diff -u b/core/modules/user/migration_templates/d6_user_picture_file.yml b/core/modules/user/migration_templates/d6_user_picture_file.yml
--- b/core/modules/user/migration_templates/d6_user_picture_file.yml
+++ b/core/modules/user/migration_templates/d6_user_picture_file.yml
@@ -10,7 +10,6 @@
     # represents the fully qualified path relative to which uris in the files
     # table are specified, and must end with a /.
     source_base_path: ''
-    source_base_path: ''
 process:
   filename: filename
   uid: uid