diff --git a/arm/config/compiler/BUILD.gn b/arm/config/compiler/BUILD.gn
index 03ff17dc..d4e0e86b 100644
--- a/arm/config/compiler/BUILD.gn
+++ b/arm/config/compiler/BUILD.gn
@@ -900,6 +900,11 @@ config("compiler_cpu_abi") {
           "-msse3",
         ]
       }
+    } else if (target_cpu == "arm64") {
+      if (!is_android && !is_nacl) {
+        cflags += [ "-O3", "-Wno-unused-command-line-argument", ]
+        ldflags += [ "-Wl,-O3", "-Wno-unused-command-line-argument", ]
+      }
     } else if (current_cpu == "arm") {
       if (is_clang && !is_android && !is_nacl &&
           !(is_chromeos_lacros && is_chromeos_device)) {