diff --git a/arm/config/arm.gni b/arm/config/arm.gni
index efa90050..5da27beb 100644
--- a/arm/config/arm.gni
+++ b/arm/config/arm.gni
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//build/config/chromeos/ui_mode.gni")
 import("//build/config/v8_target_cpu.gni")
 
 # These are primarily relevant in current_cpu == "arm" contexts, where
@@ -37,6 +38,12 @@ if (current_cpu == "arm" || v8_current_cpu == "arm") {
     # has increased code density.
     arm_use_thumb = true
   }
+  
+  # For lacros build, we use ARM v8 by default.
+  if (is_chromeos_lacros && arm_arch == "") {
+    arm_version = 8
+    arm_arch = "armv8-a+crc"
+  }
 
   if (current_os == "android" || target_os == "android") {
     arm_float_abi = "softfp"