diff --git a/src/lib/routes/admin-api/events.test.ts b/src/lib/routes/admin-api/events.test.ts
index db37ba9321..bd9778ed5d 100644
--- a/src/lib/routes/admin-api/events.test.ts
+++ b/src/lib/routes/admin-api/events.test.ts
@@ -116,13 +116,26 @@ test('should anonymise any PII fields, no matter the depth', async () => {
         new ProjectAccessAddedEvent({
             createdBy: 'some@email.com',
             data: {
-                groups: [
-                    {
-                        name: 'test',
-                        project: 'default',
+                roles: {
+                    1: {
+                        roleId: 1,
+                        groups: [
+                            {
+                                id: 4,
+                            },
+                        ],
                         users: [{ username: testUsername }],
                     },
-                ],
+                },
+            },
+            preData: {
+                roles: {
+                    1: {
+                        roleId: 1,
+                        groups: [],
+                        users: [],
+                    },
+                },
             },
             project: 'default',
         }),
@@ -133,7 +146,7 @@ test('should anonymise any PII fields, no matter the depth', async () => {
         .expect(200);
 
     expect(body.events.length).toBe(1);
-    expect(body.events[0].data.groups[0].users[0].username).not.toBe(
+    expect(body.events[0].data.roles[1].users[0].username).not.toBe(
         testUsername,
     );
 });
diff --git a/src/lib/services/project-service.ts b/src/lib/services/project-service.ts
index 78d69b70a1..81be6235a7 100644
--- a/src/lib/services/project-service.ts
+++ b/src/lib/services/project-service.ts
@@ -664,6 +664,7 @@ export default class ProjectService {
                     groups: usersAndGroups.groups.map(({ id }) => id),
                     users: usersAndGroups.users.map(({ id }) => id),
                 },
+                preData: {},
             }),
         );
     }
@@ -688,9 +689,24 @@ export default class ProjectService {
                 project: projectId,
                 createdBy,
                 data: {
-                    roles,
-                    groups,
-                    users,
+                    roles: roles.reduce((prev, curr) => {
+                        prev[curr] = {
+                            roleId: curr,
+                            groups,
+                            users,
+                        };
+                        return prev;
+                    }, {}),
+                },
+                preData: {
+                    roles: roles.reduce((prev, curr) => {
+                        prev[curr] = {
+                            roleId: curr,
+                            groups: [],
+                            users: [],
+                        };
+                        return prev;
+                    }, {}),
                 },
             }),
         );
diff --git a/src/lib/types/events.ts b/src/lib/types/events.ts
index 2cc34a588f..ef16e6abe9 100644
--- a/src/lib/types/events.ts
+++ b/src/lib/types/events.ts
@@ -863,12 +863,17 @@ export class ProjectAccessAddedEvent extends BaseEvent {
     /**
      * @param createdBy accepts a string for backward compatibility. Prefer using IUser for standardization
      */
-    constructor(p: { project: string; createdBy: string | IUser; data: any }) {
+    constructor(p: {
+        project: string;
+        createdBy: string | IUser;
+        data: any;
+        preData: any;
+    }) {
         super(PROJECT_ACCESS_ADDED, p.createdBy);
-        const { project, data } = p;
+        const { project, data, preData } = p;
         this.project = project;
         this.data = data;
-        this.preData = null;
+        this.preData = preData;
     }
 }