diff --git a/sync/Dockerfile b/sync/Dockerfile
index b3f45ac..0474918 100644
--- a/sync/Dockerfile
+++ b/sync/Dockerfile
@@ -2,7 +2,7 @@
 FROM node:20-slim AS builder
 WORKDIR /app
 COPY package.json package-lock.json ./
-RUN NODE_ENV=development npm install
+RUN NODE_ENV=development npm install && ls node_modules/.bin/tsc && echo "tsc OK"
 COPY tsconfig.json ./
 COPY src ./src
 RUN ./node_modules/.bin/tsc && npm prune --production