diff --git a/ci/docker/runtime_functions.sh b/ci/docker/runtime_functions.sh
index a1607665f4bb..f29ff7fcfa70 100755
--- a/ci/docker/runtime_functions.sh
+++ b/ci/docker/runtime_functions.sh
@@ -1137,7 +1137,7 @@ deploy_docs() {
     set -ex
     pushd .
 
-    make docs -W
+    make docs SPHINXOPTS=-W
 
     popd
 }