diff --git a/django/db/backends/sqlite3/base.py b/django/db/backends/sqlite3/base.py
index 0ee5e069b2..64da52e45f 100644
--- a/django/db/backends/sqlite3/base.py
+++ b/django/db/backends/sqlite3/base.py
@@ -182,7 +182,7 @@ def _sqlite_extract(lookup_type, dt):
         dt = util.typecast_timestamp(dt)
     except (ValueError, TypeError):
         return None
-    return getattr(dt, lookup_type)
+    return unicode(getattr(dt, lookup_type))
 
 def _sqlite_date_trunc(lookup_type, dt):
     try: