diff --git a/media/webrtc/trunk/build/build_config.h b/media/webrtc/trunk/build/build_config.h
index 1a9579e..4f311c5 100644
--- a/media/webrtc/trunk/build/build_config.h
+++ b/media/webrtc/trunk/build/build_config.h
@@ -156,6 +156,9 @@
 #elif defined(__alpha__)
 #define ARCH_CPU_ALPHA 1
 #define ARCH_CPU_64_BITS 1
+#elif defined(__aarch64__)
+#define ARCH_CPU_AARCH64 1
+#define ARCH_CPU_64_BITS 1
 #else
 #error Please add support for your architecture in build/build_config.h
 #endif