diff --git a/tge/outputters/json.py b/tge/outputters/json.py
index ab72b1f..697cc6b 100644
--- a/tge/outputters/json.py
+++ b/tge/outputters/json.py
@@ -19,9 +19,9 @@ def output_forum (data, destination):
         out_file.write(json.dumps({"title": data.title}, indent=4))
 
     for category in data.categories:
-        os.makedirs(os.path.join(destination, category.title))
+        os.makedirs(os.path.join(destination, sanitize_title(category.title)))
         for board in category.children:
-            output_board(board, os.path.join(destination, category.title, sanitize_title(board.title)))
+            output_board(board, os.path.join(destination, sanitize_title(category.title), sanitize_title(board.title)))
 
 def output_board (data, destination):
     os.makedirs(destination)