diff --git a/conf/app.src b/conf/app.src
index 35c1310..ca59bed 100644
--- a/conf/app.src
+++ b/conf/app.src
@@ -1,5 +1,5 @@
 SOURCE_URL=https://releases.rocket.chat/4.7.1/download
-SOURCE_SUM=
+SOURCE_SUM=457145954a4e542a5a839223c1724640b8d329f30c3318443f5301afdb7c5b6c
 SOURCE_SUM_PRG=sha256sum
 SOURCE_FORMAT=tar.gz
 SOURCE_IN_SUBDIR=true