diff --git a/app/cdash/app/Model/BuildGroup.php b/app/cdash/app/Model/BuildGroup.php
index 197b58a6a0..9ab4e28455 100644
--- a/app/cdash/app/Model/BuildGroup.php
+++ b/app/cdash/app/Model/BuildGroup.php
@@ -369,7 +369,7 @@ public function Delete(): bool
                 ])->first();
             }
 
-            $newGroup?->builds()->attach($oldbuild);
+            $newGroup?->builds()->syncWithoutDetaching($oldbuild);
         }
 
         // We delete the buildgroup