diff --git a/tools/gnu-du-backup-size-compare.sh b/tools/gnu-du-backup-size-compare.sh
index 4a199dc..85b876b 100755
--- a/tools/gnu-du-backup-size-compare.sh
+++ b/tools/gnu-du-backup-size-compare.sh
@@ -28,5 +28,6 @@ cd "${CCOLLECT_SOURCES}"
 while [ "$#" -gt 0 ]; do
    source="$1"; shift
    fsource="${CCOLLECT_SOURCES}/${source}"
-   du "${fsource}/"* "${fsource}"
+   du -s "${fsource}/"* "${fsource}"
+   # du -l should follow
 done