diff --git a/scene/gui/check_box.cpp b/scene/gui/check_box.cpp
index ac156f5144..309152ba8f 100644
--- a/scene/gui/check_box.cpp
+++ b/scene/gui/check_box.cpp
@@ -61,9 +61,9 @@ bool CheckBox::is_radio()
         parent = parent->get_parent();
         if (dynamic_cast< ButtonGroup* >(parent))
             break;
-    } while (parent != nullptr);
+    } while (parent);
 
-    return (parent != nullptr);
+    return (parent != 0);
 }
 
 CheckBox::CheckBox(const String &p_text):