diff --git a/patches/chromium/.patches b/patches/chromium/.patches
index aa2403bafc0f7..18d385a0f9f4f 100644
--- a/patches/chromium/.patches
+++ b/patches/chromium/.patches
@@ -200,3 +200,4 @@ fix_wayland_window_call_setwindowgeometry_for_position_updates.patch
 add_mse_support_to_brightsign_video_player_os-19598.patch
 feat_enable_hls_support_when_brightsign_media_player_is_enabled.patch
 feat_add_video_audio-codecs-supported_flag_support.patch
+brightsign_enable_viewport_options_when_viewport_enabled_os-20339.patch
diff --git a/patches/chromium/brightsign_enable_viewport_options_when_viewport_enabled_os-20339.patch b/patches/chromium/brightsign_enable_viewport_options_when_viewport_enabled_os-20339.patch
new file mode 100644
index 0000000000000..22b98f0a1ce55
--- /dev/null
+++ b/patches/chromium/brightsign_enable_viewport_options_when_viewport_enabled_os-20339.patch
@@ -0,0 +1,27 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Tariq Bashir <tbashir@brightsign.biz>
+Date: Wed, 18 Feb 2026 09:45:57 +0000
+Subject: Brightsign: Enable viewport options when viewport enabled OS-20339
+
+This patch enables the viewport options when the viewport is enabled, and matches
+what is done in QtWebEngine. This is necessary to match Android defaults and ensure
+that the viewport behaves as expected.
+
+diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
+index e49ccf4ffc115a78abceeddd7f452aeeb5c6a917..213720fb0f5ba536aaa6527e9edea9a0efd4e547 100644
+--- a/content/browser/web_contents/web_contents_impl.cc
++++ b/content/browser/web_contents/web_contents_impl.cc
+@@ -3089,6 +3089,13 @@ const blink::web_pref::WebPreferences WebContentsImpl::ComputeWebPreferences() {
+ #endif
+   }
+ 
++  if (prefs.viewport_enabled) {
++    // We need to enable the viewport options together as it doesn't really work
++    // to enable them separately. With viewport-enabled we match Android defaults.
++    prefs.viewport_meta_enabled = true;
++    prefs.shrinks_viewport_contents_to_fit = true;
++  }
++
+   prefs.spatial_navigation_enabled =
+       command_line.HasSwitch(switches::kEnableSpatialNavigation);
+