diff --git a/libs/data-access/database/prisma/schema.prisma b/libs/data-access/database/prisma/schema.prisma
index ccf183889..d0b3412ec 100644
--- a/libs/data-access/database/prisma/schema.prisma
+++ b/libs/data-access/database/prisma/schema.prisma
@@ -72,7 +72,7 @@ model StudentSettings {
   username          String  @id
   learningStatistics Boolean @default(false)
   hasLearningDiary  Boolean  @default(false)
-  student           Student @relation(fields: [username], references: [username])
+  student           Student @relation(fields: [username], references: [username], onDelete: Cascade)
 }