diff --git a/backend/Dockerfile b/backend/Dockerfile
index 60b1266..25258f7 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -3,7 +3,7 @@ FROM eclipse-temurin:17-jdk-alpine AS build
 WORKDIR /app
 # Copy root parent POM so Maven can resolve it via relativePath (../pom.xml)
 COPY pom.xml /pom.xml
-COPY backend/mvnw backend/pom.xml ./
+COPY backend/mvnw backend/pom.xml backend/checkstyle.xml ./
 COPY backend/.mvn .mvn
 COPY backend/src src
 RUN --mount=type=cache,target=/root/.m2 ./mvnw -B package -DskipTests -q