diff --git a/3rdparty/ocornut-imgui/widgets/dock.inl b/3rdparty/ocornut-imgui/widgets/dock.inl
index 206a4bee0..76bad4932 100644
--- a/3rdparty/ocornut-imgui/widgets/dock.inl
+++ b/3rdparty/ocornut-imgui/widgets/dock.inl
@@ -71,6 +71,7 @@ namespace ImGui
 				, active(true)
 				, status(Status_Float)
 				, opened(false)
+				, first(true)
 			{
 				location[0] = 0;
 				children[0] = children[1] = NULL;