diff --git a/patches/helium/ui/layout/zen-mode.patch b/patches/helium/ui/layout/zen-mode.patch
index e8659dc6..4ba59071 100644
--- a/patches/helium/ui/layout/zen-mode.patch
+++ b/patches/helium/ui/layout/zen-mode.patch
@@ -2413,3 +2413,23 @@
        ToastId::kImageCopied,
        ToastSpecification::Builder(features::IsRoundedIconsEnabled()
                                        ? kContentCopyIcon
+--- a/chrome/browser/ui/views/side_panel/side_panel.cc
++++ b/chrome/browser/ui/views/side_panel/side_panel.cc
+@@ -83,12 +83,15 @@ gfx::RoundedCornersF GetContentRoundedCo
+       side_panel->GetWidget() && side_panel->GetWidget()->IsFullscreen();
+   const int window_edge_radius =
+       is_fullscreen ? generic_radius : GetPaddedFrameRadius();
+-  const bool vertical_tabstrip_on_panel_side =
++  const bool vertical_tabstrip_touches_window_edge =
+       browser_view->ShouldDrawVerticalTabStrip() &&
++      (!browser_view->IsZenModeEnabledForLayout() ||
++       browser_view->IsZenModeSideChromePinned()) &&
+       (browser_view->IsVerticalTabStripRightAligned() ==
+        side_panel->IsRightAligned());
+   const int lower_window_edge_radius =
+-      !vertical_tabstrip_on_panel_side ? window_edge_radius : generic_radius;
++      vertical_tabstrip_touches_window_edge ? generic_radius
++                                            : window_edge_radius;
+ 
+   return side_panel->IsRightAligned()
+              ? gfx::RoundedCornersF(generic_radius, generic_radius,