diff --git a/.tugboat/config.yml b/.tugboat/config.yml
index c4a7c97f68..0a0451dfff 100644
--- a/.tugboat/config.yml
+++ b/.tugboat/config.yml
@@ -104,6 +104,10 @@ services:
         - cp "${TUGBOAT_ROOT}"/.tugboat/*.crt /usr/local/share/ca-certificates
         - update-ca-certificates
 
+        # Write OAuth keys to files for next-build Preview Server validation
+        - echo ${OAUTH_PUBLIC_KEY} >> ${TUGBOAT_ROOT}/public.key
+        - echo ${OAUTH_PRIVATE_KEY} >> ${TUGBOAT_ROOT}/private.key
+
         # Install drush-launcher, if desired.
         - wget -O /usr/local/bin/drush https://github.com/drush-ops/drush-launcher/releases/download/0.6.0/drush.phar
         - chmod +x /usr/local/bin/drush