diff --git a/product/ERP5/PropertySheet/SolverSelection.py b/product/ERP5/PropertySheet/SolverSelection.py
index b781ea2d6eb7f34f9ebb6d24dcff8656aecdfb2e..1d645ecd55adee4b00f9c5250c54dfc3cd578559 100644
--- a/product/ERP5/PropertySheet/SolverSelection.py
+++ b/product/ERP5/PropertySheet/SolverSelection.py
@@ -48,3 +48,5 @@ class SolverSelection:
        'default'     : (),
        'mode'        : 'w' },
   )
+
+  _categories = ('solver',)