diff --git a/imgui.cpp b/imgui.cpp
index c3c6929d..259b0fa5 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -6338,7 +6338,7 @@ static void ItemSize(ImVec2 size, ImVec2* adjust_vertical_offset)
     window->DC.CursorPosPrevLine = ImVec2(window->DC.CursorPos.x + size.x, window->DC.CursorPos.y);
     window->DC.CursorPos = ImVec2((float)(int)(window->Pos.x + window->DC.ColumnsStartX + window->DC.ColumnsOffsetX), (float)(int)(window->DC.CursorPos.y + line_height + g.Style.ItemSpacing.y));
 
-    window->SizeContentsFit = ImMax(window->SizeContentsFit, ImVec2(window->DC.CursorPosPrevLine.x, window->DC.CursorPos.y) - window->Pos + ImVec2(0.0f, window->ScrollY));
+    window->SizeContentsFit = ImMax(window->SizeContentsFit, ImVec2(window->DC.CursorPosPrevLine.x - window->Pos.x, window->DC.CursorPos.y + window->ScrollY - window->Pos.y));
 
     window->DC.PrevLineHeight = line_height;
     window->DC.CurrentLineHeight = 0.0f;