diff --git a/ui/src/app/applications/components/application-sync-panel/application-sync-panel.tsx b/ui/src/app/applications/components/application-sync-panel/application-sync-panel.tsx
index 1513c5e1eab3a..1304a973351f9 100644
--- a/ui/src/app/applications/components/application-sync-panel/application-sync-panel.tsx
+++ b/ui/src/app/applications/components/application-sync-panel/application-sync-panel.tsx
@@ -22,6 +22,7 @@ export const ApplicationSyncPanel = ({application, selectedResource, hide}: {app
     const syncStrategy = {} as models.SyncStrategy;
     const [isPending, setPending] = React.useState(false);
     const source = getAppDefaultSource(application);
+
     return (
         <Consumer>
             {ctx => (
@@ -57,8 +58,11 @@ export const ApplicationSyncPanel = ({application, selectedResource, hide}: {app
                             onSubmit={async (params: any) => {
                                 setPending(true);
                                 let resources = appResources.filter((_, i) => params.resources[i]);
+
                                 const syncFlags = {...params.syncFlags} as SyncFlags;
-                                if (syncFlags.Prune && resources.length === appResources.length) {
+                                const prune = syncFlags.Prune || false;
+
+                                if (prune && resources.length === appResources.length) {
                                     const confirmed = await ctx.popup.confirm('Synchronize with prune?', () => (
                                         <div>
                                             <i className='fa fa-exclamation-triangle' style={{color: ARGO_WARNING_COLOR}} />
@@ -70,6 +74,7 @@ export const ApplicationSyncPanel = ({application, selectedResource, hide}: {app
                                         return;
                                     }
                                 }
+
                                 if (resources.length === appResources.length) {
                                     resources = null;
                                 }
@@ -85,6 +90,7 @@ export const ApplicationSyncPanel = ({application, selectedResource, hide}: {app
                                         return;
                                     }
                                 }
+
                                 const force = syncFlags.Force || false;
 
                                 if (syncFlags.ApplyOnly) {