diff --git a/docs/BUILD.md b/docs/BUILD.md
index 0d02ee2..d2bce3a 100644
--- a/docs/BUILD.md
+++ b/docs/BUILD.md
@@ -81,7 +81,7 @@ curl -s "http://<SIDECAR_URL>/pair-qr?token=<TOKEN>"
 Or one-liner (reads token from tmux pane automatically):
 ```bash
 TOKEN=$(tmux capture-pane -t pi-sidecar -p | grep -o 'token=[^ ]*' | head -1 | cut -d= -f2) && \
-SIDECAR=$(tmux capture-pane -t pi-sidecar -p | grep -o 'http://[^ ]*' | head -1 | sed 's/?.*//') && \
+SIDECAR=$(tmux capture-pane -t pi-sidecar -p | grep -o 'http://[^ ]*' | head -1 | sed 's/?.*//; s|/$||') && \
 curl -s "$SIDECAR/pair-qr?token=$TOKEN"
 ```