diff --git a/api/booking-sheet.js b/api/booking-sheet.js
index 9b75ce5..eedb18c 100644
--- a/api/booking-sheet.js
+++ b/api/booking-sheet.js
@@ -113,10 +113,11 @@ async function parseBookingSheet() {
     return null;
   }
   const sheetName = process.env.BOOKING_SHEET_TAB || 'Booking Sheet';
+  const quotedName = `'${sheetName}'`;
 
   const response = await sheets.spreadsheets.values.get({
     spreadsheetId: sheetId,
-    range: `${sheetName}!A:J`,
+    range: `${quotedName}!A:J`,
   });
 
   const rows = response.data.values || [];
@@ -249,6 +250,7 @@ async function assignBooking(guestName, accommodationType, selectedDays) {
     const sheets = await getSheetsClient();
     const sheetId = process.env.BOOKING_SHEET_ID;
     const sheetName = process.env.BOOKING_SHEET_TAB || 'Booking Sheet';
+    const quotedName = `'${sheetName}'`;
     const rowNum = bed.rowIndex + 1; // Sheets is 1-indexed
 
     // Build batch update data for each selected day column
@@ -258,7 +260,7 @@ async function assignBooking(guestName, accommodationType, selectedDays) {
       if (colIdx === undefined) continue;
       const colLetter = colIdxToLetter(colIdx);
       data.push({
-        range: `${sheetName}!${colLetter}${rowNum}`,
+        range: `${quotedName}!${colLetter}${rowNum}`,
         values: [[guestName]],
       });
     }