diff --git a/scripts/helper-update-manifest-readme b/scripts/helper-update-manifest-readme
index 1a2bc1a..4135c25 100644
--- a/scripts/helper-update-manifest-readme
+++ b/scripts/helper-update-manifest-readme
@@ -2,7 +2,7 @@
  
 url=$(curl -s https://api.github.com/repos/duniter/cesium/releases/latest | grep "browser_" | grep "web" | head -1 | cut -d\" -f4)
 wget -nc --quiet $url -P /tmp
-CHECKSUM=$sha256sum /tmp/cesium-*-web.zip
+CHECKSUM=$(sudo sha256sum /tmp/cesium-*-web.zip | head -c 64)
 sed -i "s/SOURCE_SUM=.*/SOURCE_SUM=${CHECKSUM}/" /conf/app.src
 
 PACKAGE_VERSION=