diff --git a/dist/tools/usb-serial/list-ttys.sh b/dist/tools/usb-serial/list-ttys.sh
index 9bd4c0c492..6b834b98c3 100755
--- a/dist/tools/usb-serial/list-ttys.sh
+++ b/dist/tools/usb-serial/list-ttys.sh
@@ -3,4 +3,5 @@
 # Public License v2.1. See the file LICENSE in the top level directory for more
 # details.
 
-./ttys.py --format path
+SCRIPTDIR="$(cd "$(dirname "$0")" || exit 1; pwd)"
+"$SCRIPTDIR"/ttys.py --format path