diff --git a/lib/Doctrine/ORM/Tools/Cli/Tasks/RunSqlTask.php b/lib/Doctrine/ORM/Tools/Cli/Tasks/RunSqlTask.php
index 211cd93f5..b644fb983 100644
--- a/lib/Doctrine/ORM/Tools/Cli/Tasks/RunSqlTask.php
+++ b/lib/Doctrine/ORM/Tools/Cli/Tasks/RunSqlTask.php
@@ -44,6 +44,29 @@ class RunSqlTask extends AbstractTask
                 ->writeln(' --file=<path> | --sql=<SQL>', 'INFO');
     }
     
+    /**
+     * @inheritdoc
+     */
+    public function validate()
+    {
+        if ( ! parent::validate()) {
+            return false;
+        }
+        
+        $args= $this->getArguments();
+        
+        $isSql = isset($args['sql']);
+        $isFile = isset($args['file']);
+        
+        if ( ! ($isSql ^ $isFile)) {
+            $printer->writeln("One of --sql or --file required, and only one.", 'ERROR');
+            return false;
+        }
+        
+        return true;
+    }
+    
+    
     /**
      * Executes the task.
      */