diff --git a/sources/update-sources.sh b/sources/update-sources.sh
index 79fd057..8e1a82f 100755
--- a/sources/update-sources.sh
+++ b/sources/update-sources.sh
@@ -2,7 +2,7 @@
 
 set -eou pipefail
 
-DIRECTORY=$(dirname "$0")
+DIRECTORY=$(realpath "$(dirname "$0")")
 PACKAGES_FILE="$DIRECTORY/packages.txt"
 SOURCES_FILE="$DIRECTORY/sources.json"