diff --git a/backend/services/admin-service/Dockerfile b/backend/services/admin-service/Dockerfile
index a3c0bc12..17a96bf6 100644
--- a/backend/services/admin-service/Dockerfile
+++ b/backend/services/admin-service/Dockerfile
@@ -53,12 +53,14 @@ RUN DATABASE_URL="postgresql://user:pass@localhost:5432/db" npx prisma generate
 COPY --from=builder /app/dist ./dist
 
 # Create startup script that runs migrations before starting the app
-RUN echo '#!/bin/sh\n\
-set -e\n\
-echo "Running database migrations..."\n\
-npx prisma migrate deploy || npx prisma db push --accept-data-loss\n\
-echo "Starting application..."\n\
-exec node dist/main.js\n' > /app/start.sh && chmod +x /app/start.sh
+RUN printf '%s\n' \
+    '#!/bin/sh' \
+    'set -e' \
+    'echo "Running database migrations..."' \
+    'npx prisma migrate deploy || npx prisma db push --accept-data-loss' \
+    'echo "Starting application..."' \
+    'exec node dist/main.js' \
+    > /app/start.sh && chmod +x /app/start.sh
 
 # Create non-root user
 RUN groupadd -g 1001 nodejs && \