diff --git a/gramps/gen/config.py b/gramps/gen/config.py
index 5bf0fd468..af3c73789 100644
--- a/gramps/gen/config.py
+++ b/gramps/gen/config.py
@@ -143,6 +143,7 @@ register('behavior.generation-depth', 15)
 register('behavior.ignore-gexiv2', False)
 register('behavior.ignore-osmgpsmap', False)
 register('behavior.ignore-spellcheck', False)
+register('behavior.ignore-sdn', False)
 register('behavior.max-age-prob-alive', 110)
 register('behavior.max-sib-age-diff', 20)
 register('behavior.min-generation-years', 13)
diff --git a/gramps/gen/lib/calendar.py b/gramps/gen/lib/calendar.py
index acdcf8b84..f8bd9376d 100644
--- a/gramps/gen/lib/calendar.py
+++ b/gramps/gen/lib/calendar.py
@@ -580,7 +580,9 @@ try:
     #TODO maybe alias the other local invented wheels to Calendar convertors
 
 except ImportError:
-    import logging
-    LOG = logging.getLogger(".calendar")
-    LOG.warn("sdn not available. "
-            "Install Calendar with pypi for native Hebrew calendar calculations.")
+    from gramps.gen.config import config
+    if not config.get('behavior.ignore-sdn'):
+        import logging
+        LOG = logging.getLogger(".calendar")
+        LOG.warn("sdn not available. "
+                 "Install Calendar with pypi for native Hebrew calendar calculations.")
diff --git a/gramps/gui/configure.py b/gramps/gui/configure.py
index 5b1fe09a5..30d708968 100644
--- a/gramps/gui/configure.py
+++ b/gramps/gui/configure.py
@@ -621,6 +621,10 @@ class GrampsPreferences(ConfigureDialog):
             table, _('Suppress warning when spell checking not installed.'), 
             6, 'behavior.ignore-spellcheck')
         
+        self.add_checkbox(
+            table, _("Suppress warning when 'sdn' not installed."), 
+            7, 'behavior.ignore-sdn')
+        
         return _('Warnings'), table
 
     def _build_name_format_model(self, active):