diff --git a/patches/helium/ui/fix-caption-bounds.patch b/patches/helium/ui/fix-caption-bounds.patch
new file mode 100644
index 00000000..447b18fc
--- /dev/null
+++ b/patches/helium/ui/fix-caption-bounds.patch
@@ -0,0 +1,44 @@
+--- a/components/remote_cocoa/app_shim/browser_native_widget_window_mac.mm
++++ b/components/remote_cocoa/app_shim/browser_native_widget_window_mac.mm
+@@ -63,13 +63,10 @@ const double kThinControllerHeight = 0.5
+ }
+ 
+ - (CGFloat)_minXTitlebarWidgetInset {
+-  if (@available(macOS 26, *)) {
+-    // On macOS 26, position the leading window widget the same distance from
+-    // the leading edge of the window as it is from the top of the window. That
+-    // way the window corner can be adjusted to make the widget concentric.
+-    return 13.0;
+-  }
+-  return [super _minXTitlebarWidgetInset];
++  // Both macOS 15- and macOS 26+ use the same inset here, but
++  // 1px is invisible on macOS 15- for some reason. Ideally it should be 11px here,
++  // but since it appears visually to be 11, we just use 10 here for both styles.
++  return 10.0;
+ }
+ 
+ // Override -_getCachedWindowCornerRadius rather than -_cornerRadius because the
+@@ -78,7 +75,7 @@ const double kThinControllerHeight = 0.5
+ // _getCachedWindowCornerRadius.
+ - (CGFloat)_getCachedWindowCornerRadius {
+   if (@available(macOS 26, *)) {
+-    return 13.0 /* widget position from top and left */ +
++    return 10.0 /* widget position from top and left */ +
+            7.0 /* widget radius */;
+   }
+   // Don't mess with the window radius before macOS 26, as concentricity was not
+--- a/chrome/browser/ui/views/frame/browser_frame_view_mac.mm
++++ b/chrome/browser/ui/views/frame/browser_frame_view_mac.mm
+@@ -465,10 +465,10 @@ BrowserFrameViewMac::GetCaptionButtonBou
+   // not precise.
+   if (@available(macOS 26, *)) {
+     result.bounds = gfx::RectF(12, 10, 62, 18);
+-    result.margins = gfx::OutsetsF::VH(10, 12);
++    result.margins = gfx::OutsetsF::VH(0, 6);
+   } else {
+     result.bounds = gfx::RectF(20, 11, 54, 16);
+-    result.margins = gfx::OutsetsF::VH(11, 20);
++    result.margins = gfx::OutsetsF::VH(0, 14);
+   }
+ 
+   // Mirror for when caption buttons are on the "wrong" side.
diff --git a/patches/series b/patches/series
index 698c4028..9120bb4a 100644
--- a/patches/series
+++ b/patches/series
@@ -266,6 +266,7 @@ helium/ui/ublock-show-in-settings.patch
 helium/ui/licenses-in-credits.patch
 helium/ui/remove-autofill-link-to-password-manager.patch
 helium/ui/fix-caption-button-tab-strip-align.patch
+helium/ui/fix-caption-bounds.patch
 helium/ui/find-bar.patch
 helium/ui/remove-zoom-action.patch
 helium/ui/experiments/compact-action-toolbar.patch