diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 8584ef01c687147601966663f4e72dbda4650e5b..548fabef9f8ccb0a45332eba1f904e03d9783003 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1237,6 +1237,8 @@ pages:
   dependencies:
     - doc-tarball
   image: ghcci/x86_64-linux-deb9:0.2
+  # See #18973
+  allow_failure: true
   tags:
     - x86_64-linux
   script: