diff --git a/Dockerfile b/Dockerfile
index 844e4fb..ac3882f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,6 +14,8 @@ WORKDIR /app
 COPY bin/linux_amd64/spark-server /usr/local/bin/spark-server
 COPY bin/linux_amd64/spark-migrate /usr/local/bin/spark-migrate
 COPY bin/linux_amd64/spark-seed /usr/local/bin/spark-seed
+# Windows cross-compile does not keep the executable bit.
+RUN chmod 755 /usr/local/bin/spark-server /usr/local/bin/spark-migrate /usr/local/bin/spark-seed
 COPY migrations /app/migrations
 RUN mkdir -p /app/logs && chown -R spark:spark /app
 USER spark