diff --git a/beat/core/library.py b/beat/core/library.py
index 3a9b7cc7dbbc684d163c70d0644c0af6b4cf271e..b575bd8eb3dfc867f828537885dc1a8cfc99a82a 100644
--- a/beat/core/library.py
+++ b/beat/core/library.py
@@ -147,7 +147,7 @@ class Library(BackendLibrary):
         # At this point, `data' can be a dictionary or ``None``
         if data is None:  # loads the default declaration for an library
             self.data, self.errors = prototypes.load("library")
-            assert not self.errors, "\n  * %s" % "\n  *".join(self.errors)
+            assert not self.errors, "\n  * %s" % "\n  *".join(self.errors)  # nosec
         else:  # just assign it
             # this runs basic validation, including JSON loading if required
             self.data, self.errors = schema.validate("library", data)