diff --git a/src/sage_setup/find.py b/src/sage_setup/find.py
index a6a023941eb..b5cf9095d51 100644
--- a/src/sage_setup/find.py
+++ b/src/sage_setup/find.py
@@ -399,7 +399,7 @@ def installed_files_by_module(site_packages, modules=('sage',)):
     Namespace packages::
 
         sage: files_by_module['sage.graphs.graph_decompositions']
-        {...'sage/graphs/graph_decompositions/__init__.py'...}
+        set()
 
     This takes about 30ms with warm cache::