diff --git a/backend/src/graphql/model/Contribution.ts b/backend/src/graphql/model/Contribution.ts
index 59c156cad..a683534af 100644
--- a/backend/src/graphql/model/Contribution.ts
+++ b/backend/src/graphql/model/Contribution.ts
@@ -56,7 +56,7 @@ export class Contribution {
   @Field(() => Date, { nullable: true })
   deletedAt: Date | null
 
-  @Field(() => Number, { nullable: true })
+  @Field(() => Int, { nullable: true })
   deletedBy: number | null
 
   @Field(() => Date)
diff --git a/backend/src/graphql/resolver/ContributionResolver.test.ts b/backend/src/graphql/resolver/ContributionResolver.test.ts
index 477bc2a5e..274067ba0 100644
--- a/backend/src/graphql/resolver/ContributionResolver.test.ts
+++ b/backend/src/graphql/resolver/ContributionResolver.test.ts
@@ -825,7 +825,7 @@ describe('ContributionResolver', () => {
           )
         })
 
-        it('calls sendContributionDeniedEmail', async () => {
+        it('calls sendContributionDeniedEmail', () => {
           expect(sendContributionDeniedEmail).toBeCalledWith({
             firstName: 'Bibi',
             lastName: 'Bloxberg',
@@ -2391,7 +2391,7 @@ describe('ContributionResolver', () => {
               )
             })
 
-            it('calls sendContributionDeletedEmail', async () => {
+            it('calls sendContributionDeletedEmail', () => {
               expect(sendContributionDeletedEmail).toBeCalledWith({
                 firstName: 'Peter',
                 lastName: 'Lustig',