diff --git a/scrapy/spidermiddlewares/referer.py b/scrapy/spidermiddlewares/referer.py
index d64c79108..8ee04120a 100644
--- a/scrapy/spidermiddlewares/referer.py
+++ b/scrapy/spidermiddlewares/referer.py
@@ -159,9 +159,8 @@ class StrictOriginPolicy(ReferrerPolicy):
     name = POLICY_STRICT_ORIGIN
 
     def referrer(self, response, request):
-        if ((urlparse_cached(response).scheme == 'https' and
-             self.potentially_trustworthy(request))
-             or urlparse_cached(response).scheme == 'http'):
+        if ((self.tls_protected(response) and self.potentially_trustworthy(request))
+            or not self.tls_protected(response)):
             return self.origin_referrer(response)