diff --git a/update.sh b/update.sh
index 92a7a2c1a9dd2733fe6510be8cf5ce9a0c230ca1..b209a9328b958ad0bc3ffed77c3eaaf04103396c 100755
--- a/update.sh
+++ b/update.sh
@@ -1,3 +1,6 @@
+#!/bin/bash
+
+SSH_ENV="$HOME/.ssh/environment"
 
 function start_agent {
   echo "Initializing new SSH agent..."