diff --git a/media/webrtc/trunk/build/build_config.h b/media/webrtc/trunk/build/build_config.h
index 93a28855b2..b61720e7f2 100644
--- a/media/webrtc/trunk/build/build_config.h
+++ b/media/webrtc/trunk/build/build_config.h
@@ -164,6 +164,9 @@
 #define ARCH_CPU_ARM_FAMILY 1
 #define ARCH_CPU_ARM64 1
 #define ARCH_CPU_64_BITS 1
+#elif defined(__loongarch64)
+#define ARCH_CPU_LOONGARCH64 1
+#define ARCH_CPU_64_BITS 1
 #else
 #error Please add support for your architecture in build/build_config.h
 #endif