diff --git a/Dockerfile.build b/Dockerfile.build
index 2a412fa0f..90b525992 100644
--- a/Dockerfile.build
+++ b/Dockerfile.build
@@ -1,4 +1,5 @@
 FROM openjdk:8-jdk-alpine
 WORKDIR /build
 CMD [ "./build.sh" ]
+RUN apk add bash
 COPY build.sh .