diff --git a/.github/workflows/updater.sh b/.github/workflows/updater.sh
index ad75bfb..6a28689 100755
--- a/.github/workflows/updater.sh
+++ b/.github/workflows/updater.sh
@@ -69,26 +69,19 @@ src="app"
 tempdir="$(mktemp -d)"
 
 # Download sources and calculate checksum
-filename=${asset_url##*/}
+filename="temp.tar.gz"
 curl --silent -4 -L $asset_url -o "$tempdir/$filename"
 checksum=$(sha256sum "$tempdir/$filename" | head -c 64)
 
 # Delete temporary directory
 rm -rf $tempdir
 
-# Get extension
-if [[ $filename == *.tar.gz ]]; then
-  extension=tar.gz
-else
-  extension=${filename##*.}
-fi
-
 # Rewrite source file
 cat <<EOT > conf/$src.src
 SOURCE_URL=$asset_url
 SOURCE_SUM=$checksum
 SOURCE_SUM_PRG=sha256sum
-SOURCE_FORMAT=$extension
+SOURCE_FORMAT=tar.gz
 SOURCE_IN_SUBDIR=true
 SOURCE_FILENAME=
 EOT