diff --git a/webrtc/rtc_base/system/arch.h b/webrtc/rtc_base/system/arch.h
index ed216e6..aee3756 100644
--- a/webrtc/rtc_base/system/arch.h
+++ b/webrtc/rtc_base/system/arch.h
@@ -27,6 +27,13 @@
 #define WEBRTC_ARCH_ARM_FAMILY
 #define WEBRTC_ARCH_64_BITS
 #define WEBRTC_ARCH_LITTLE_ENDIAN
+#elif defined(__riscv) || defined(__riscv__)
+#define WEBRTC_ARCH_LITTLE_ENDIAN
+#if __riscv_xlen == 64
+#define WEBRTC_ARCH_64_BITS
+#else
+#define WEBRTC_ARCH_32_BITS
+#endif
 #elif defined(_M_IX86) || defined(__i386__)
 #define WEBRTC_ARCH_X86_FAMILY
 #define WEBRTC_ARCH_X86