diff --git a/nginx/snippets/security-headers-base.conf b/nginx/snippets/security-headers-base.conf
index 4efea358..40104334 100644
--- a/nginx/snippets/security-headers-base.conf
+++ b/nginx/snippets/security-headers-base.conf
@@ -1,10 +1,12 @@
 add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
 add_header X-Content-Type-Options "nosniff" always;
 add_header Referrer-Policy "no-referrer" always;
-add_header Expect-CT "enforce, max-age=63072000" always;
 add_header Cross-Origin-Opener-Policy "same-origin" always;
 add_header Cross-Origin-Embedder-Policy "require-corp" always;
 
+# obsolete when client system time is correct
+add_header Expect-CT "enforce, max-age=63072000" always;
+
 # obsolete and replaced with Content-Security-Policy frame-ancestors 'none'
 add_header X-Frame-Options "DENY" always;