diff --git a/director/director_ui_test.go b/director/director_ui_test.go
index 470bddea8..3e1ad5415 100644
--- a/director/director_ui_test.go
+++ b/director/director_ui_test.go
@@ -38,6 +38,7 @@ func TestListServers(t *testing.T) {
 	func() {
 		serverAdMutex.Lock()
 		defer serverAdMutex.Unlock()
+		serverAds.DeleteAll()
 		serverAds.Set(mockOriginServerAd, mockNamespaceAds(5, "origin1"), ttlcache.DefaultTTL)
 		serverAds.Set(mockCacheServerAd, mockNamespaceAds(4, "cache1"), ttlcache.DefaultTTL)
 		require.True(t, serverAds.Has(mockOriginServerAd))