diff --git a/conf/app.src b/conf/app.src
index 54c4ae7..8918b58 100644
--- a/conf/app.src
+++ b/conf/app.src
@@ -1,6 +1,6 @@
 SOURCE_URL=https://api.github.com/repos/jgraph/drawio/tarball/v18.0.3
 SOURCE_SUM=3096dabfcd8b89d95f75f7b648a6e3caaae26db96b9fb0425aa502ee242857fa
 SOURCE_SUM_PRG=sha256sum
-SOURCE_FORMAT=3
+SOURCE_FORMAT=tar.gz
 SOURCE_IN_SUBDIR=true
 SOURCE_FILENAME=