diff --git a/nibabel/testing/__init__.py b/nibabel/testing/__init__.py
index 0ba82d6cb..992ef2ead 100644
--- a/nibabel/testing/__init__.py
+++ b/nibabel/testing/__init__.py
@@ -150,9 +150,10 @@ class clear_and_catch_warnings(warnings.catch_warnings):
     Examples
     --------
     >>> import warnings
-    >>> with clear_and_catch_warnings(modules=[np.core.fromnumeric]):
+    >>> with clear_and_catch_warnings(modules=[np.lib.scimath]):
     ...     warnings.simplefilter('always')
-    ...     # do something that raises a warning in np.core.fromnumeric
+    ...     # do something that raises a warning in np.lib.scimath
+    ...     _ = np.arccos(90)
     """
 
     class_modules = ()