diff --git a/additional/python/check_security.py b/additional/python/check_security.py
index c9c60e3..3ce1abe 100644
--- a/additional/python/check_security.py
+++ b/additional/python/check_security.py
@@ -36,6 +36,8 @@ def get_additional_sources():
             continue
         if "ubuntu-esm-infra.list" in entry: # Ubuntu ESM
             continue
+        if "ubuntu.sources" in entry: # Ubuntu ESM
+            continue
         lines = jfiles.get_all_lines_from_file(entry)
 
         for line in lines: