diff --git a/lessons/05-making-tiny-containers/C-multi-stage-builds.md b/lessons/05-making-tiny-containers/C-multi-stage-builds.md
index 7f3fd5c..e74928f 100644
--- a/lessons/05-making-tiny-containers/C-multi-stage-builds.md
+++ b/lessons/05-making-tiny-containers/C-multi-stage-builds.md
@@ -17,6 +17,7 @@ Make a new Dockerfile, call it `Dockerfile`.
 ```dockerfile
 # build stage
 FROM node:20 AS node-builder
+RUN mkdir /build
 WORKDIR /build
 COPY package-lock.json package.json ./
 RUN npm ci