diff --git a/Telegram/build/prepare/linux.sh b/Telegram/build/prepare/linux.sh
index d3ee5b5be..e4d2f920e 100755
--- a/Telegram/build/prepare/linux.sh
+++ b/Telegram/build/prepare/linux.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 set -e
 FullExecPath=$PWD
 pushd `dirname $0` > /dev/null