diff --git a/tests/xapian_tests/tests/xapian_query.py b/tests/xapian_tests/tests/xapian_query.py
index 05fdd6f..3b0c115 100644
--- a/tests/xapian_tests/tests/xapian_query.py
+++ b/tests/xapian_tests/tests/xapian_query.py
@@ -125,16 +125,21 @@ class XapianSearchQueryTestCase(TestCase):
         self.sq.add_filter(SQ(title__in=["Dune", "Jaws"]))
         self.assertEqual(self.sq.build_query().get_description(), 'Xapian::Query((why AND (XTITLEdune OR XTITLEjaws)))')
 
+    def test_build_query_not_in_filter_single_words(self):
+        self.sq.add_filter(SQ(content='why'))
+        self.sq.add_filter(~SQ(title__in=["Dune", "Jaws"]))
+        self.assertEqual(self.sq.build_query().get_description(), 'Xapian::Query((why AND (<alldocuments> AND_NOT (XTITLEdune OR XTITLEjaws))))')
+
     def test_build_query_in_filter_multiple_words(self):
         self.sq.add_filter(SQ(content='why'))
         self.sq.add_filter(SQ(title__in=["A Famous Paper", "An Infamous Article"]))
         self.assertEqual(self.sq.build_query().get_description(), 'Xapian::Query((why AND ((XTITLEa PHRASE 3 XTITLEfamous PHRASE 3 XTITLEpaper) OR (XTITLEan PHRASE 3 XTITLEinfamous PHRASE 3 XTITLEarticle))))')
     
-    # def test_build_query_not_in_filter_multiple_words(self):
-    #     self.sq.add_filter(SQ(content='why'))
-    #     self.sq.add_filter(~SQ(title__in=["A Famous Paper", "An Infamous Article"]))
-    #     self.assertEqual(self.sq.build_query().get_description(), 'Xapian::Query((why AND_NOT (XTITLEa famous paper OR XTITLEan infamous article)))')
-    # 
+    def test_build_query_not_in_filter_multiple_words(self):
+        self.sq.add_filter(SQ(content='why'))
+        self.sq.add_filter(~SQ(title__in=["A Famous Paper", "An Infamous Article"]))
+        self.assertEqual(self.sq.build_query().get_description(), 'Xapian::Query((why AND (<alldocuments> AND_NOT ((XTITLEa PHRASE 3 XTITLEfamous PHRASE 3 XTITLEpaper) OR (XTITLEan PHRASE 3 XTITLEinfamous PHRASE 3 XTITLEarticle)))))')
+    
     # def test_build_query_in_filter_datetime(self):
     #     self.sq.add_filter(SQ(content='why'))
     #     self.sq.add_filter(SQ(pub_date__in=[datetime.datetime(2009, 7, 6, 1, 56, 21)]))
diff --git a/xapian_backend.py b/xapian_backend.py
index b4f2716..62ebb91 100755
--- a/xapian_backend.py
+++ b/xapian_backend.py
@@ -1003,7 +1003,10 @@ class SearchQuery(BaseSearchQuery):
                         xapian.Query.OP_OR, self._term_query(value, field)
                     )
                 )
-        return xapian.Query(xapian.Query.OP_OR, query_list)
+        if is_not:
+            return xapian.Query(xapian.Query.OP_AND_NOT, self._all_query(), xapian.Query(xapian.Query.OP_OR, query_list))          
+        else:
+            return xapian.Query(xapian.Query.OP_OR, query_list)
     
     def _all_query(self):
         return xapian.Query('')