diff --git a/packages/backend/src/api/endpoints/OrganizationApi.ts b/packages/backend/src/api/endpoints/OrganizationApi.ts
index e2164fec96b..25483f91410 100644
--- a/packages/backend/src/api/endpoints/OrganizationApi.ts
+++ b/packages/backend/src/api/endpoints/OrganizationApi.ts
@@ -77,7 +77,7 @@ type DeleteOrganizationMembershipParams = {
 
 type CreateOrganizationInvitationParams = {
   organizationId: string;
-  inviterUserId: string;
+  inviterUserId: string | null;
   emailAddress: string;
   role: OrganizationMembershipRole;
   redirectUrl?: string;