diff --git a/django/middleware/common.py b/django/middleware/common.py
index 820609e3a5..d18d23fa43 100644
--- a/django/middleware/common.py
+++ b/django/middleware/common.py
@@ -74,7 +74,7 @@ class CommonMiddleware(MiddlewareMixin):
         Return True if settings.APPEND_SLASH is True and appending a slash to
         the request path turns an invalid path into a valid one.
         """
-        if settings.APPEND_SLASH and not request.get_full_path().endswith('/'):
+        if settings.APPEND_SLASH and not request.path_info.endswith('/'):
             urlconf = getattr(request, 'urlconf', None)
             return (
                 not is_valid_path(request.path_info, urlconf) and
diff --git a/tests/middleware/tests.py b/tests/middleware/tests.py
index a51c4eeb31..7f8faf7630 100644
--- a/tests/middleware/tests.py
+++ b/tests/middleware/tests.py
@@ -83,6 +83,18 @@ class CommonMiddlewareTest(SimpleTestCase):
         r = CommonMiddleware().process_response(request, response)
         self.assertEqual(r.url, '/slash/?test=1')
 
+    @override_settings(APPEND_SLASH=True)
+    def test_append_slash_redirect_querystring_have_slash(self):
+        """
+        APPEND_SLASH should append slash to path when redirecting a request
+        with a querystring ending with slash.
+        """
+        request = self.rf.get('/slash?test=slash/')
+        response = HttpResponseNotFound()
+        r = CommonMiddleware().process_response(request, response)
+        self.assertIsInstance(r, HttpResponsePermanentRedirect)
+        self.assertEqual(r.url, '/slash/?test=slash/')
+
     @override_settings(APPEND_SLASH=True, DEBUG=True)
     def test_append_slash_no_redirect_on_POST_in_DEBUG(self):
         """