diff --git a/entry b/entry
index 7d8b35e..9c9a8c9 100755
--- a/entry
+++ b/entry
@@ -3,7 +3,7 @@ set -ex
 
 trap exit TERM INT
 
-BIN_DIR="/usr/sbin"
+BIN_DIR="${BIN_DIR:-/usr/sbin}"
 
 info() {
     { set +x; } 2> /dev/null