diff --git a/news/956.tests b/news/956.tests
new file mode 100644
index 0000000..fc57308
--- /dev/null
+++ b/news/956.tests
@@ -0,0 +1,3 @@
+Fixed tests when using Zope 5.11.
+In one test we got a `mappingproxy` instead of a dictionary.
+[maurits]
diff --git a/src/plone/base/tests/messages.rst b/src/plone/base/tests/messages.rst
index 2187c65..f6ec452 100644
--- a/src/plone/base/tests/messages.rst
+++ b/src/plone/base/tests/messages.rst
@@ -36,7 +36,7 @@ And at last there is the possibility of variable substitution:
   >>> msg.default
   'Hello ${name}'
 
-  >>> msg.mapping
+  >>> dict(msg.mapping)
   {'name': 'Plone'}
 
 Messages with translation service set up