diff --git a/Dockerfile b/Dockerfile
index 2c8fa7f8a..9c12b26cd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -65,15 +65,15 @@ RUN mkdir -p /usr/src/criu \
     && make install-criu \
     && rm -rf /usr/src/criu
 
-# setup a playground for us to spawn containers in
-ENV ROOTFS /busybox
-RUN mkdir -p ${ROOTFS}
-
 COPY script/tmpmount /
 WORKDIR /go/src/github.com/opencontainers/runc
 ENTRYPOINT ["/tmpmount"]
 
-ADD . /go/src/github.com/opencontainers/runc
-
+# setup a playground for us to spawn containers in
+COPY tests/integration/multi-arch.bash tests/integration/
+ENV ROOTFS /busybox
+RUN mkdir -p "${ROOTFS}"
 RUN . tests/integration/multi-arch.bash \
-    && curl -fsSL `get_busybox` | tar xfJC - ${ROOTFS}
+    && curl -fsSL `get_busybox` | tar xfJC - "${ROOTFS}"
+
+COPY . .