diff --git content/common/sandbox_win.cc content/common/sandbox_win.cc
index 54e31d365696..8a2374e48b51 100644
--- content/common/sandbox_win.cc
+++ content/common/sandbox_win.cc
@@ -793,8 +793,11 @@ sandbox::ResultCode StartSandboxedProcess(
 #endif
 
   // Post-startup mitigations.
-  mitigations = sandbox::MITIGATION_STRICT_HANDLE_CHECKS |
-                sandbox::MITIGATION_DLL_SEARCH_ORDER;
+  mitigations = sandbox::MITIGATION_DLL_SEARCH_ORDER;
+  if (!browser_command_line.HasSwitch("win-rt-app")) {
+    // Don't enable this mitigation in WinRT apps. See issue #2274.
+    mitigations |= sandbox::MITIGATION_STRICT_HANDLE_CHECKS;
+  }
 
   result = policy->SetDelayedProcessMitigations(mitigations);
   if (result != sandbox::SBOX_ALL_OK)