diff --git a/common/notification/hooks.ts b/common/notification/hooks.ts
index e79d695d5..3016fb1eb 100644
--- a/common/notification/hooks.ts
+++ b/common/notification/hooks.ts
@@ -8,12 +8,13 @@ import { prisma } from '../prisma';
 import { userForStudent } from '../user';
 import * as Notification from '../../common/notification';
 import { SpecificNotificationContext } from './actions';
+import { dissolve_reason } from '@prisma/client';
 
 registerStudentHook(
     'deactivate-student',
     'Account gets deactivated, matches are dissolved, courses are cancelled',
     async (student) => {
-        await deactivateStudent(student, true, 'missing coc');
+        await deactivateStudent(student, true, 'missing coc', [dissolve_reason.accountDeactivatedNoCoC]);
     } // the hook does not send out a notification again, the user already knows that their account was deactivated
 );
 
diff --git a/common/student/activation.ts b/common/student/activation.ts
index fdeb4567e..4420c8fef 100644
--- a/common/student/activation.ts
+++ b/common/student/activation.ts
@@ -11,7 +11,12 @@ import { userForStudent } from '../user';
 import { CertificateState } from '../certificate';
 import { removeAllPushSubcriptions } from '../notification/channels/push';
 
-export async function deactivateStudent(student: Student, silent = false, reason?: string) {
+export async function deactivateStudent(
+    student: Student,
+    silent = false,
+    reason?: string,
+    dissolveReasons: dissolve_reason[] = [dissolve_reason.accountDeactivated]
+) {
     if (!student.active) {
         throw new Error('Student was already deactivated');
     }
@@ -32,7 +37,7 @@ export async function deactivateStudent(student: Student, silent = false, reason
         },
     });
     for (const match of matches) {
-        await dissolveMatch(match, [dissolve_reason.accountDeactivated], student, dissolved_by_enum.student);
+        await dissolveMatch(match, dissolveReasons, student, dissolved_by_enum.student);
     }
 
     // Remove any pending certificates, so that they no longer show up in pupil dashboards
diff --git a/prisma/migrations/20250120143543_no_co_c_dissolve_reason/migration.sql b/prisma/migrations/20250120143543_no_co_c_dissolve_reason/migration.sql
new file mode 100644
index 000000000..a29c67431
--- /dev/null
+++ b/prisma/migrations/20250120143543_no_co_c_dissolve_reason/migration.sql
@@ -0,0 +1,2 @@
+-- AlterEnum
+ALTER TYPE "dissolve_reason" ADD VALUE 'accountDeactivatedNoCoC';
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index fe0c451f0..b70cfd4b5 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -1555,6 +1555,7 @@ enum dissolved_by_enum {
 
 enum dissolve_reason {
   accountDeactivated // The account was deactivated, causing any active matches to be dissolved automatically
+  accountDeactivatedNoCoC // The account was deactivated because the student did not hand in a Certificate of Conduct
   ghosted // "Mein:e Lernpartner:in hat sich nicht zurückgemeldet"
   noMoreHelpNeeded // "Mein:e Lernpartner:in benötigt keine Unterstützung mehr" and "Ich benötige keine Unterstützung mehr"
   isOfNoHelp // "Ich konnte meinem/meiner Lernpartner:in nicht behilflich sein" and "Mein:e Lernpartner:in konnte mir nicht behilflich sein"