diff --git a/imgui.cpp b/imgui.cpp
index 3787d1b4..55eb344c 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -4202,7 +4202,7 @@ bool ImGui::Begin(const char* name, bool* p_open, const ImVec2& size_on_first_us
 
         // Update ContentsRegionMax. All the variable it depends on are set above in this function.
         window->ContentsRegionRect.Min.x = -window->Scroll.x + window->WindowPadding.x;
-        window->ContentsRegionRect.Min.x = -window->Scroll.y + window->WindowPadding.y + window->TitleBarHeight() + window->MenuBarHeight();
+        window->ContentsRegionRect.Min.y = -window->Scroll.y + window->WindowPadding.y + window->TitleBarHeight() + window->MenuBarHeight();
         window->ContentsRegionRect.Max.x = -window->Scroll.x - window->WindowPadding.x + (window->SizeContentsExplicit.x != 0.0f ? window->SizeContentsExplicit.x : (window->Size.x - window->ScrollbarSizes.x)); 
         window->ContentsRegionRect.Max.y = -window->Scroll.y - window->WindowPadding.y + (window->SizeContentsExplicit.y != 0.0f ? window->SizeContentsExplicit.y : (window->Size.y - window->ScrollbarSizes.y));