diff --git a/packages/trpc/server/routers/viewer/slots/util.ts b/packages/trpc/server/routers/viewer/slots/util.ts
index fbd63249b1..882a2281d0 100644
--- a/packages/trpc/server/routers/viewer/slots/util.ts
+++ b/packages/trpc/server/routers/viewer/slots/util.ts
@@ -292,7 +292,7 @@ export async function getAvailableSlots({ input, ctx }: GetScheduleOptions) {
     }`
   );
   const getStartTime = (startTimeInput: string, timeZone?: string) => {
-    const startTimeMin = dayjs.utc().add(eventType.minimumBookingNotice, "minutes");
+    const startTimeMin = dayjs.utc().add(eventType.minimumBookingNotice || 1, "minutes");
     const startTime = timeZone === "Etc/GMT" ? dayjs.utc(startTimeInput) : dayjs(startTimeInput).tz(timeZone);
 
     return startTimeMin.isAfter(startTime) ? startTimeMin.tz(timeZone) : startTime;