diff --git a/portainer/rootfs/etc/cont-init.d/00-portainer_install.sh b/portainer/rootfs/etc/cont-init.d/00-aaa_portainer_install.sh
similarity index 95%
rename from portainer/rootfs/etc/cont-init.d/00-portainer_install.sh
rename to portainer/rootfs/etc/cont-init.d/00-aaa_portainer_install.sh
index 02a2d74de..fcb55887f 100644
--- a/portainer/rootfs/etc/cont-init.d/00-portainer_install.sh
+++ b/portainer/rootfs/etc/cont-init.d/00-aaa_portainer_install.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 if [ -e "/PORTFILE" ]; then
     echo "Installing portainer..." 
-    BUILD_UPSTREAM=$(cat /PORTFILE)
+    BUILD_UPSTREAM=$(</PORTFILE)
     BUILD_ARCH=$(uname -m)
 
     echo "${BUILD_ARCH}"