diff --git a/readthedocs/settings/base.py b/readthedocs/settings/base.py
index 9eacf3cab61..dbba4e48eb0 100644
--- a/readthedocs/settings/base.py
+++ b/readthedocs/settings/base.py
@@ -669,6 +669,7 @@ def DOCKER_LIMITS(self):
         'accept',
         'origin',
         'authorization',
+        'x-hoverxref-version',
         'x-csrftoken'
     )
     # Additional protection to allow only idempotent methods.