diff --git a/scripts/upgrade b/scripts/upgrade
index 546d0d5..35048d4 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -72,7 +72,7 @@ local mount_id=$(exec_occ files_external:create --output=json \
 current_version=$(grep OC_VersionString "$install_dir/version.php" | cut -d\' -f2)
 current_major_version=${current_version%%.*}
 
-last_version=$(ynh_read_manifest --key="resources.sources.main.url" | grep -o '[0-9][0-9]\.[0-9]\.[0-9]')
+last_version=$(ynh_read_manifest --manifest_key="resources.sources.main.url" | grep -o '[0-9][0-9]\.[0-9]\.[0-9]')
 last_major_version=${last_version%%.*}
 
 if [ "$upgrade_type" == "UPGRADE_APP" ]