diff --git a/deps/v8/BUILD.gn b/deps/v8/BUILD.gn
index 9a2b2cdd..e61c3615 100644
--- a/deps/v8/BUILD.gn
+++ b/deps/v8/BUILD.gn
@@ -32,7 +32,7 @@ target_is_simulator = (target_cpu != v8_target_cpu && !v8_multi_arch_build) ||
                       (current_cpu != v8_current_cpu && v8_multi_arch_build)
 
 # For faster Windows builds. See https://crbug.com/v8/8475.
-emit_builtins_as_inline_asm = is_win && is_clang
+emit_builtins_as_inline_asm = is_msvc && is_clang
 
 declare_args() {
   # Print to stdout on Android.
@@ -6929,7 +6929,7 @@ v8_source_set("v8_heap_base") {
   ]
 
   if (current_cpu == "x64") {
-    if (is_win) {
+    if (is_msvc) {
       # Prefer a masm version with unwind directives.
       sources += [ "src/heap/base/asm/x64/push_registers_masm.asm" ]
     } else {
diff --git a/deps/v8/src/heap/base/asm/x64/push_registers_asm.cc b/deps/v8/src/heap/base/asm/x64/push_registers_asm.cc
index 554caddf..8bf9c4eb 100644
--- a/deps/v8/src/heap/base/asm/x64/push_registers_asm.cc
+++ b/deps/v8/src/heap/base/asm/x64/push_registers_asm.cc
@@ -21,8 +21,48 @@
 // Source: https://github.com/hjl-tools/x86-psABI/wiki/x86-64-psABI-1.0.pdf
 
 #ifdef _WIN64
-#error "The masm based version must be used for Windows"
-#endif
+
+asm(".globl PushAllRegistersAndIterateStack             \n"
+    "PushAllRegistersAndIterateStack:                   \n"
+    // rbp is callee-saved. Maintain proper frame pointer for debugging.
+    "  push %rbp                                        \n"
+    "  mov %rsp, %rbp                                   \n"
+    // Dummy for alignment.
+    "  push $0xCDCDCD                                   \n"
+    "  push %rsi                                        \n"
+    "  push %rdi                                        \n"
+    "  push %rbx                                        \n"
+    "  push %r12                                        \n"
+    "  push %r13                                        \n"
+    "  push %r14                                        \n"
+    "  push %r15                                        \n"
+    "  sub $160, %rsp                                   \n"
+    // Use aligned instrs as we are certain that the stack is properly aligned.
+    "  movdqa %xmm6, 144(%rsp)                          \n"
+    "  movdqa %xmm7, 128(%rsp)                          \n"
+    "  movdqa %xmm8, 112(%rsp)                          \n"
+    "  movdqa %xmm9, 96(%rsp)                           \n"
+    "  movdqa %xmm10, 80(%rsp)                          \n"
+    "  movdqa %xmm11, 64(%rsp)                          \n"
+    "  movdqa %xmm12, 48(%rsp)                          \n"
+    "  movdqa %xmm13, 32(%rsp)                          \n"
+    "  movdqa %xmm14, 16(%rsp)                          \n"
+    "  movdqa %xmm15, (%rsp)                            \n"
+    // Pass 1st parameter (rcx) unchanged (Stack*).
+    // Pass 2nd parameter (rdx) unchanged (StackVisitor*).
+    // Save 3rd parameter (r8; IterateStackCallback)
+    "  mov %r8, %r9                                     \n"
+    // Pass 3rd parameter as rsp (stack pointer).
+    "  mov %rsp, %r8                                    \n"
+    // Call the callback.
+    "  call *%r9                                        \n"
+    // Pop the callee-saved registers.
+    "  add $224, %rsp                                   \n"
+    // Restore rbp as it was used as frame pointer.
+    "  pop %rbp                                         \n"
+    "  ret                                              \n");
+
+#else  // !_WIN64
 
 asm(
 #ifdef __APPLE__
@@ -64,3 +104,5 @@ asm(
     ".Lfunc_end0-PushAllRegistersAndIterateStack        \n"
 #endif  // !defined(__APPLE__)
     );
+
+#endif  // !_WIN64
diff --git a/tools/v8_gypfiles/v8.gyp b/tools/v8_gypfiles/v8.gyp
index 32f00097..e122551d 100644
--- a/tools/v8_gypfiles/v8.gyp
+++ b/tools/v8_gypfiles/v8.gyp
@@ -1953,7 +1953,7 @@
           }],
           # Changes in push_registers_asm.cc in V8 v12.8 requires using
           # push_registers_masm on Windows even with ClangCL on x64
-          ['OS=="win"', {
+          ['OS=="msvc"', {
             'conditions': [
               ['_toolset == "host" and host_arch == "x64" or _toolset == "target" and target_arch=="x64"', {
                 'sources': [