diff --git a/cachecontrol/adapter.py b/cachecontrol/adapter.py
index 27f58fc7..fe6643e9 100644
--- a/cachecontrol/adapter.py
+++ b/cachecontrol/adapter.py
@@ -58,6 +58,11 @@ def build_response(self, request, response):
                 resp = self.controller.update_cached_response(
                     request, response
                 )
+                # Fix possible exception when using missing `raw` field in
+                # requests
+                # TODO: remove when requests will be bump to 2.2.2 or 2.3
+                # version
+                resp.raw = None
             else:
                 # try to cache the response
                 self.controller.cache_response(request, resp)