diff --git a/build/config/win/BUILD.gn b/build/config/win/BUILD.gn
index 3df1b355b56f91..d39f978a58f1e6 100644
--- a/build/config/win/BUILD.gn
+++ b/build/config/win/BUILD.gn
@@ -131,7 +131,9 @@ config("compiler") {
     # microarchitecture. MSVC only supports a subset of architectures, and the
     # next step after SSE2 will be AVX.
     if (current_cpu == "x86" || current_cpu == "x64") {
-      cflags += [ "-msse3" ]
+        if (target_cpu == "x64") {
+          cflags += [ "-msse3" ]
+        }
     }
 
     # Enable ANSI escape codes if something emulating them is around (cmd.exe
diff --git a/chrome/chrome_elf/hook_util/hook_util.cc b/chrome/chrome_elf/hook_util/hook_util.cc
index 207f93c1fd6faf..4ed7bb1b67d547 100644
--- a/chrome/chrome_elf/hook_util/hook_util.cc
+++ b/chrome/chrome_elf/hook_util/hook_util.cc
@@ -10,7 +10,6 @@
 #include "chrome/chrome_elf/nt_registry/nt_registry.h"  // utils
 #include "sandbox/win/src/interception_internal.h"
 #include "sandbox/win/src/internal_types.h"
-#include "sandbox/win/src/sandbox_utils.h"
 #include "sandbox/win/src/service_resolver.h"
 
 namespace {
@@ -218,7 +217,8 @@ sandbox::ServiceResolverThunk* HookSystemService(bool relaxed) {
   // handling one like it does in 32-bit versions).
   thunk = new sandbox::ServiceResolverThunk(current_process, relaxed);
 #else
-  if (nt::IsCurrentProcWow64()) {
+  BOOL is_wow64 = FALSE;
+  if (::IsWow64Process(::GetCurrentProcess(), &is_wow64) && is_wow64) {
     if (::IsWindows10OrGreater())
       thunk = new sandbox::Wow64W10ResolverThunk(current_process, relaxed);
     else if (::IsWindows8OrGreater())