diff --git a/scopesim/__init__.py b/scopesim/__init__.py
index 5a80de59..80ac461e 100644
--- a/scopesim/__init__.py
+++ b/scopesim/__init__.py
@@ -22,7 +22,8 @@
 
 warnings.simplefilter('ignore', UserWarning)
 warnings.simplefilter('ignore', FutureWarning)
-warnings.simplefilter('ignore', RuntimeWarning)    # warnings for the developer
+warnings.simplefilter('ignore', RuntimeWarning)  # warnings for the developer
+warnings.simplefilter('default', DeprecationWarning)  # allow in general
 warnings.simplefilter('ignore', category=AstropyWarning)
 yaml.warnings({'YAMLLoadWarning': False})