diff --git a/Dockerfile b/Dockerfile
index 38c4ca5..8e1f4ce 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,6 +2,7 @@ FROM spritsail/busybox:libressl
 
 ARG PLEX_VER=latest
 ARG PLEX_URL
+ARG PLEX_SHA
 ARG LIBSTDCPP_VER=8-20180312-2
 ARG LIBGCC1_VER=8-20180312-2