diff --git a/.buildkite/pipelines/pull_request/pipeline.sh b/.buildkite/pipelines/pull_request/pipeline.sh
index 62783029fe..26c1de4636 100755
--- a/.buildkite/pipelines/pull_request/pipeline.sh
+++ b/.buildkite/pipelines/pull_request/pipeline.sh
@@ -5,6 +5,7 @@ set -euo pipefail
 cd '.buildkite'
 
 if [[ "${ELASTIC_BUILDKITE_INFRA:-}" =~ ^(1|true)$ ]]; then
+  yarn install
   # The new infra requires the pipeline to emit the steps
   yarn -s print:pipeline
 else