diff --git a/Dockerfile b/Dockerfile
index 9ef04949..ac31214c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -20,6 +20,7 @@ RUN <<EOF
   apt-get update
   apt-get --no-install-recommends -y install \
     samba \
+    mtools \
     wimtools \
     dos2unix \
     cabextract \