(fixed issue #1691)

std/java/_std/Reflect.hx

@@ -220,7 +220,7 @@ import java.Boot;
 		Delete an object field.
 	**/
 	@:functionCode('
-		return (o instanceof haxe.lang.DynamicObject && ((haxe.lang.DynamicObject) o).__hx_deleteField(f));
+		return (o instanceof haxe.lang.DynamicObject && ((haxe.lang.DynamicObject) o).__hx_deleteField(field));
 	')
 	public static function deleteField( o : Dynamic, field : String ) : Bool
 	{