diff --git a/lib/magazines.ts b/lib/magazines.ts
index 635c42ee..ccafbe6f 100644
--- a/lib/magazines.ts
+++ b/lib/magazines.ts
@@ -34,7 +34,7 @@ export type MagazineMetaData = {
 
 export type MagazineIssueData = {
   book: string;
-  volume: number;
+  volume: number | null;
   part: number;
   title: string;
   slug: string;
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index aaf6f024..94eefe08 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -226,7 +226,7 @@ model MagazineMeta {
 model MagazineIssue {
   id         String   @id @default(auto()) @map("_id") @db.ObjectId
   book       String
-  volume     Int
+  volume     Int?
   part       Int
   title      String
   slug       String