diff --git a/src/util/build_config.h b/src/util/build_config.h
index be9b532..667f009 100644
--- a/src/util/build_config.h
+++ b/src/util/build_config.h
@@ -167,6 +167,9 @@
 #elif defined(__e2k__)
 #define ARCH_CPU_64_BITS 1
 #define ARCH_CPU_LITTLE_ENDIAN 1
+#elif defined(__riscv) && (__riscv_xlen == 64)
+#define ARCH_CPU_64_BITS 1
+#define ARCH_CPU_LITTLE_ENDIAN 1
 #else
 #error Please add support for your architecture in build_config.h
 #endif