diff --git a/CHANGELOG.md b/CHANGELOG.md
index 954a51188..ad1ab29b0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,8 @@
 #### Collectors
 
 #### Parsers
+- `intelmq.bots.parsers.shadowserver._config`:
+  - fix error message formatting if schema file is absent (PR#2528 by Sebastian Wagner).
 
 #### Experts
 
diff --git a/docs/user/bots.md b/docs/user/bots.md
index 2c8ec6e9d..433fe98ef 100644
--- a/docs/user/bots.md
+++ b/docs/user/bots.md
@@ -2202,7 +2202,7 @@ For example using `curl -s https://interchange.shadowserver.org/intelmq/v1/schem
 
 (optional, boolean) If an existing `feed.name` should be overwritten.
 
-** `auto_update`**
+**`auto_update`**
 
 (optional, boolean) Enable automatic schema download.
 
diff --git a/intelmq/bots/parsers/shadowserver/_config.py b/intelmq/bots/parsers/shadowserver/_config.py
index fa3ed3022..57391bc77 100644
--- a/intelmq/bots/parsers/shadowserver/_config.py
+++ b/intelmq/bots/parsers/shadowserver/_config.py
@@ -341,7 +341,7 @@ def reload():
             return
     else:
         if not __config.test_mode:
-            raise ValueError("The schema file does not exist: %r.", __config.schema_file)
+            raise ValueError(f"The schema file does not exist: {__config.schema_file}.")
 
     __config.feedname_mapping.clear()
     __config.filename_mapping.clear()