diff --git a/tests/xapian_tests/tests/xapian_query.py b/tests/xapian_tests/tests/xapian_query.py
index 1c9eb51..ceff830 100644
--- a/tests/xapian_tests/tests/xapian_query.py
+++ b/tests/xapian_tests/tests/xapian_query.py
@@ -111,7 +111,7 @@ class XapianSearchQueryTestCase(TestCase):
     def test_build_query_boost(self):
         self.sq.add_filter(SQ(content='hello'))
         self.sq.add_boost('world', 5)
-        self.assertEqual(str(self.sq.build_query()), u'Xapian::Query(((Zhello OR hello) AND_MAYBE 5 * world))')
+        self.assertEqual(str(self.sq.build_query()), u'Xapian::Query(((Zhello OR hello) AND_MAYBE 5 * (Zworld OR world)))')
     
     def test_build_query_in_filter_single_words(self):
         self.sq.add_filter(SQ(content='why'))
diff --git a/xapian_backend.py b/xapian_backend.py
index 67b45ba..fbbe221 100755
--- a/xapian_backend.py
+++ b/xapian_backend.py
@@ -942,7 +942,7 @@ class SearchQuery(BaseSearchQuery):
         if self.boost:
             subqueries = [
                 xapian.Query(
-                    xapian.Query.OP_SCALE_WEIGHT, xapian.Query(term), value
+                    xapian.Query.OP_SCALE_WEIGHT, self._content_field(term, False), value
                 ) for term, value in self.boost.iteritems()
             ]
             query = xapian.Query(