diff --git a/chromium_src/chrome/browser/ui/webui/cr_components/searchbox/searchbox_handler.cc b/chromium_src/chrome/browser/ui/webui/cr_components/searchbox/searchbox_handler.cc
index 91bf3cb4405..a0ee2333266 100644
--- a/chromium_src/chrome/browser/ui/webui/cr_components/searchbox/searchbox_handler.cc
+++ b/chromium_src/chrome/browser/ui/webui/cr_components/searchbox/searchbox_handler.cc
@@ -37,8 +37,14 @@ constexpr char kLeoMessageBubbleAskIconResourceName[] =
   autocomplete_input.set_prefer_keyword(true)
 #define set_allow_exact_keyword_match(allow) set_allow_exact_keyword_match(true)
 
+// This function is used for the WebUI Omnibox which isn't enabled in Brave, so
+// its okay to disable the NOTREACHED() check here and use the default icon
+// instead.
+#define BRAVE_AUTOCOMPLETE_ICON_TO_RESOURCE_NAME_OVERRIDE return "";
+
 #include <chrome/browser/ui/webui/cr_components/searchbox/searchbox_handler.cc>
 
+#undef BRAVE_AUTOCOMPLETE_ICON_TO_RESOURCE_NAME_OVERRIDE
 #undef set_prefer_keyword
 #undef set_allow_exact_keyword_match
 #undef kProductChromeRefreshIcon
diff --git a/patches/chrome-browser-ui-webui-cr_components-searchbox-searchbox_handler.cc.patch b/patches/chrome-browser-ui-webui-cr_components-searchbox-searchbox_handler.cc.patch
new file mode 100644
index 00000000000..7395e9f3743
--- /dev/null
+++ b/patches/chrome-browser-ui-webui-cr_components-searchbox-searchbox_handler.cc.patch
@@ -0,0 +1,12 @@
+diff --git a/chrome/browser/ui/webui/cr_components/searchbox/searchbox_handler.cc b/chrome/browser/ui/webui/cr_components/searchbox/searchbox_handler.cc
+index ef24aeedc3dea2f31e49c5b87f10723be0195220..76d2641c42d4250c681eadcefc46eff4459c5a23 100644
+--- a/chrome/browser/ui/webui/cr_components/searchbox/searchbox_handler.cc
++++ b/chrome/browser/ui/webui/cr_components/searchbox/searchbox_handler.cc
+@@ -568,6 +568,7 @@ std::string SearchboxHandler::AutocompleteIconToResourceName(
+   // TODO(446953331): It's error-prone to keep the above if's up to date. When
+   //   omnibox input and popup views are replaced with webUI, matches and
+   //   actions can store an icon enum instead of `VectorIcon`.
++  BRAVE_AUTOCOMPLETE_ICON_TO_RESOURCE_NAME_OVERRIDE
+   NOTREACHED() << "Every autocomplete icon must have an equivalent SVG "
+                   "resource for the NTP Realbox. icon.name: '"
+                << icon.name << "'";