diff --git a/Library/Homebrew/cmd/vendor-install.sh b/Library/Homebrew/cmd/vendor-install.sh
index 4c76f8e856..1cda2e6a71 100644
--- a/Library/Homebrew/cmd/vendor-install.sh
+++ b/Library/Homebrew/cmd/vendor-install.sh
@@ -119,7 +119,7 @@ fetch() {
     --remote-time
     --location
     --user-agent "${HOMEBREW_USER_AGENT_CURL}"
-    --header "Authorization: Bearer QQ=="
+    --header "Authorization: Bearer ${HOMEBREW_DOCKER_REGISTRY_TOKEN:-QQ==}"
   )
 
   if [[ -n "${HOMEBREW_QUIET}" ]]