diff --git a/ui/src/app/applications/components/application-operation-state/application-operation-state.tsx b/ui/src/app/applications/components/application-operation-state/application-operation-state.tsx
index b30600368f404..65edd42db41ff 100644
--- a/ui/src/app/applications/components/application-operation-state/application-operation-state.tsx
+++ b/ui/src/app/applications/components/application-operation-state/application-operation-state.tsx
@@ -78,7 +78,7 @@ export const ApplicationOperationState: React.StatelessComponent<Props> = ({appl
                         const confirmed = await ctx.apis.popup.confirm('Terminate operation', 'Are you sure you want to terminate operation?');
                         if (confirmed) {
                             try {
-                                await services.applications.terminateOperation(application.metadata.name);
+                                await services.applications.terminateOperation(application.metadata.name, application.metadata.namespace);
                             } catch (e) {
                                 ctx.apis.notifications.show({
                                     content: <ErrorNotification title='Unable to terminate operation' e={e} />,
diff --git a/ui/src/app/shared/services/applications-service.ts b/ui/src/app/shared/services/applications-service.ts
index c4d244f957726..91ae3aa061d87 100644
--- a/ui/src/app/shared/services/applications-service.ts
+++ b/ui/src/app/shared/services/applications-service.ts
@@ -387,6 +387,7 @@ export class ApplicationsService {
     public terminateOperation(applicationName: string, appNamespace: string): Promise<boolean> {
         return requests
             .delete(`/applications/${applicationName}/operation`)
+            .query({appNamespace})
             .send()
             .then(() => true);
     }