diff --git a/shell/common/platform_util_win.cc b/shell/common/platform_util_win.cc
index 46ff9b43b4fb..c45093a559a6 100644
--- a/shell/common/platform_util_win.cc
+++ b/shell/common/platform_util_win.cc
@@ -244,7 +244,8 @@ std::string OpenExternalOnWorkerThread(
   // have been escaped.
   std::wstring escaped_url =
       L"\"" + base::UTF8ToWide(net::EscapeExternalHandlerValue(url.spec())) +
-      std::wstring working_dir = options.working_dir.value();
+      L"\"";
+  std::wstring working_dir = options.working_dir.value();
 
   if (reinterpret_cast<ULONG_PTR>(
           ShellExecuteW(nullptr, L"open", escaped_url.c_str(), nullptr,