diff --git a/media/webrtc/trunk/webrtc/typedefs.h b/media/webrtc/trunk/webrtc/typedefs.h
index 22edf454fa3..3e1456f1238 100644
--- a/media/webrtc/trunk/webrtc/typedefs.h
+++ b/media/webrtc/trunk/webrtc/typedefs.h
@@ -103,6 +103,16 @@
 #define WEBRTC_ARCH_32_BITS 1
 #define WEBRTC_ARCH_BIG_ENDIAN
 #define WEBRTC_BIG_ENDIAN
+#elif defined(__aarch64__)
+#define WEBRTC_ARCH_AARCH64 1
+#define WEBRTC_ARCH_64_BITS 1
+#if defined(__AARCH64EL__)
+#define WEBRTC_ARCH_LITTLE_ENDIAN
+#define WEBRTC_LITTLE_ENDIAN
+#elif defined(__AARCH64EB__)
+#define WEBRTC_ARCH_BIG_ENDIAN
+#define WEBRTC_BIG_ENDIAN
+#endif
 #elif defined(__alpha__)
 #define WEBRTC_ARCH_ALPHA 1
 #define WEBRTC_ARCH_64_BITS 1