diff --git a/ui/src/app/affiliation/affiliation-update.component.html b/ui/src/app/affiliation/affiliation-update.component.html
index 8a8873cec..9f9836406 100644
--- a/ui/src/app/affiliation/affiliation-update.component.html
+++ b/ui/src/app/affiliation/affiliation-update.component.html
@@ -325,7 +325,7 @@
               (change)="onStartDateSelected(true)"
             >
               <option i18n="@@gatewayApp.assertionServiceAssertion.month.string" [ngValue]="null">Month</option>
-              <option *ngFor="let month of monthsList" [ngValue]="month[0]">{{ month[1] | localize }}</option>
+              <option *ngFor="let month of monthsList" [value]="month[0]">{{ month[1] | localize }}</option>
             </select>
           </div>
           <div class="col-md-4 float-left pr-0">
diff --git a/ui/src/app/affiliation/affiliation-update.component.ts b/ui/src/app/affiliation/affiliation-update.component.ts
index 9035cb6a9..52155a625 100644
--- a/ui/src/app/affiliation/affiliation-update.component.ts
+++ b/ui/src/app/affiliation/affiliation-update.component.ts
@@ -227,10 +227,10 @@ export class AffiliationUpdateComponent implements OnInit {
         roleTitle: assertion.roleTitle,
         url: assertion.url,
         startYear: assertion.startYear,
-        startMonth: parseInt(assertion.startMonth || '') || null,
+        startMonth: assertion.startMonth,
         startDay: assertion.startDay,
         endYear: assertion.endYear,
-        endMonth: parseInt(assertion.endMonth || '') || null,
+        endMonth: assertion.endMonth,
         endDay: assertion.endDay,
         orgName: assertion.orgName,
         orgCountry: assertion.orgCountry,