diff --git a/product.py b/product.py
index e974833f42..df109532ad 100644
--- a/product.py
+++ b/product.py
@@ -21,6 +21,9 @@ class Product(OSV):
             if context['stock_date_end'] != datetime.date.today():
                 context = context.copy()
                 context['stock_date_end'] = datetime.date.today()
+        if name == 'forecast_quantity' and not context.get('stock_date_end'):
+            context = context.copy()
+            context['stock_date_end'] = datetime.date.max
         pbl = self.products_by_location(cursor, user,
                 location_ids=context['locations'], product_ids=ids,
                 with_childs=True, context=context)
@@ -51,6 +54,10 @@ class Product(OSV):
                 context = context.copy()
                 del context['stock_date_end']
 
+        if name == 'forecast_quantity' and not context.get('stock_date_end'):
+            context = context.copy()
+            context['stock_date_end'] = datetime.date.max
+
         pbl = self.products_by_location(
             cursor, user, location_ids=context['locations'], with_childs=True,
             skip_zero=False, context=context).iteritems()