diff --git a/dist/tools/usb-serial/find-tty.sh b/dist/tools/usb-serial/find-tty.sh
index 136513d3ef..5da8470bc6 100755
--- a/dist/tools/usb-serial/find-tty.sh
+++ b/dist/tools/usb-serial/find-tty.sh
@@ -6,8 +6,9 @@
 
 exit_code=1
 
+SCRIPTDIR="$(cd "$(dirname "$0")" || exit 1; pwd)"
 for serial in "$@"; do
-    if ./ttys.py --format path --serial "$serial"; then
+    if "$SCRIPTDIR"/ttys.py --format path --serial "$serial"; then
         exit_code=0
     fi
 done
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