diff --git a/packages/booking-flow/lib/components/EnterDetails/Details/MemberPriceModal/index.tsx b/packages/booking-flow/lib/components/EnterDetails/Details/MemberPriceModal/index.tsx
index da1d8881e..757a37841 100644
--- a/packages/booking-flow/lib/components/EnterDetails/Details/MemberPriceModal/index.tsx
+++ b/packages/booking-flow/lib/components/EnterDetails/Details/MemberPriceModal/index.tsx
@@ -39,7 +39,7 @@ export default function MemberPriceModal() {
     trigger("membershipNo").then((isValid) => {
       const { isDirty } = getFieldState("membershipNo")
       updatePriceForMembershipNo(membershipNo, isValid)
-      if (isValid && isDirty) {
+      if (isValid && isDirty && !!membershipNo) {
         setIsOpen(true)
       }
     })
diff --git a/packages/booking-flow/lib/stores/enter-details/index.ts b/packages/booking-flow/lib/stores/enter-details/index.ts
index 122aebd76..9da99b664 100644
--- a/packages/booking-flow/lib/stores/enter-details/index.ts
+++ b/packages/booking-flow/lib/stores/enter-details/index.ts
@@ -197,13 +197,16 @@ export function createDetailsStore(
               produce((state: DetailsState) => {
                 const currentRoom = state.rooms[idx].room
 
-                currentRoom.guest.join = false
                 currentRoom.guest.membershipNo = isValid ? membershipNo : ""
 
                 const isValidMembershipNo = isValid && !!membershipNo
+
+                if (isValidMembershipNo) {
+                  currentRoom.guest.join = false
+                }
                 currentRoom.roomPrice = getRoomPrice(
                   currentRoom.roomRate,
-                  isValidMembershipNo
+                  isValidMembershipNo || currentRoom.guest.join
                 )
 
                 const nights = dt(state.booking.toDate).diff(
@@ -235,7 +238,10 @@ export function createDetailsStore(
                   currentRoom.guest.membershipNo = ""
                 }
 
-                currentRoom.roomPrice = getRoomPrice(currentRoom.roomRate, join)
+                currentRoom.roomPrice = getRoomPrice(
+                  currentRoom.roomRate,
+                  join || !!currentRoom.guest.membershipNo
+                )
 
                 const nights = dt(state.booking.toDate).diff(
                   state.booking.fromDate,