diff --git a/django/middleware/common.py b/django/middleware/common.py
index 3d57fa4367..5cb7ca1bd3 100644
--- a/django/middleware/common.py
+++ b/django/middleware/common.py
@@ -108,7 +108,7 @@ class CommonMiddleware(object):
             if response.has_header('ETag'):
                 etag = response['ETag']
             else:
-                etag = md5.new(response.content).hexdigest()
+                etag = '"%s"' % md5.new(response.content).hexdigest()
             if response.status_code >= 200 and response.status_code < 300 and request.META.get('HTTP_IF_NONE_MATCH') == etag:
                 cookies = response.cookies
                 response = http.HttpResponseNotModified()
diff --git a/django/utils/cache.py b/django/utils/cache.py
index 4fcf493944..603199cc7e 100644
--- a/django/utils/cache.py
+++ b/django/utils/cache.py
@@ -104,7 +104,7 @@ def patch_response_headers(response, cache_timeout=None):
     if cache_timeout < 0:
         cache_timeout = 0 # Can't have max-age negative
     if not response.has_header('ETag'):
-        response['ETag'] = md5.new(response.content).hexdigest()
+        response['ETag'] = '"%s"' % md5.new(response.content).hexdigest()
     if not response.has_header('Last-Modified'):
         response['Last-Modified'] = http_date()
     if not response.has_header('Expires'):