diff --git a/entrypoint.sh b/entrypoint.sh
index 40711cf..00fcb7e 100644
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -2,6 +2,7 @@
 set -e
 
 # Remove a potentially pre-existing server.pid for Rails.
+mkdir -p /opt/app/tmp/pids
 rm -f /opt/app/tmp/pids/server.pid
 
 # Then exec the container's main process (what's set as CMD in the Dockerfile).