diff --git a/install-wings.sh b/install-wings.sh
index 7e4c922..9ff0adc 100644
--- a/install-wings.sh
+++ b/install-wings.sh
@@ -34,9 +34,19 @@ need_tty() {
 
 prompt() {
   local msg="$1"
-  local out
+  local out line
   printf "${BOLD}%s${RESET}" "$msg" >"$TTY"
   IFS= read -r out <"$TTY"
+
+  # A pasted value (e.g. join-data copied from the panel UI) can arrive with an
+  # embedded newline. `read` stops at the first one, which would otherwise
+  # silently truncate the rest onto a "phantom" line consumed by a later
+  # prompt. Drain any additional lines that are already buffered so nothing
+  # gets lost; this never blocks waiting on new keystrokes.
+  while IFS= read -r -t 0.1 line <"$TTY" 2>/dev/null; do
+    out+="$line"
+  done
+
   printf "%s" "$out"
 }
 
@@ -223,7 +233,8 @@ section "Configuration"
 # Pulls just the base64 join-data token out of whatever the user pastes.
 # Accepts:
 #   - the raw token by itself
-#   - the full "wings configure --join-data <token>" command
+#   - the full "calagopus-wings configure --join-data <token>" command as
+#     generated by the panel (or the older "wings configure --join-data ..." form)
 #   - either wrapped in single/double quotes, with extra surrounding whitespace
 extract_join_data() {
   local raw="$1"
@@ -248,7 +259,7 @@ extract_join_data() {
 }
 
 if confirm_default_no "Run wings configure --join-data now?"; then
-  JOIN_DATA_RAW="$(prompt "Paste join-data (raw token or the full 'wings configure --join-data ...' command): ")"
+  JOIN_DATA_RAW="$(prompt "Paste join-data (raw token or the full 'calagopus-wings configure --join-data ...' command): ")"
   JOIN_DATA="$(extract_join_data "$JOIN_DATA_RAW")"
 
   if [[ -n "$JOIN_DATA" ]]; then