diff --git a/wcs/forms/root.ptl b/wcs/forms/root.ptl
index 004fd1b0c..3a844345c 100644
--- a/wcs/forms/root.ptl
+++ b/wcs/forms/root.ptl
@@ -250,7 +250,7 @@ class FormPage(Directory):
     def get_namespaces(self):
         namespaces = {
             'pp': getattr(lasso, 'PP11_HREF', getattr(lasso, 'PP_HREF', None)), # support old lasso
-            'ep': lasso.EP_HREF,
+            'ep': getattr(lasso, 'EP_HREF', ''),
             'eoa': 'urn:entrouvert:id-sis-adeline:2005-09', # eo schema for adeline
             'cafp': 'urn:entrouvert:id-sis-caf-profile:2005-09', # eo schema for caf
         }