--- a/src/util/build_config.h
+++ b/src/util/build_config.h
@@ -170,6 +170,9 @@
 #elif defined(__e2k__)
 #define ARCH_CPU_64_BITS 1
 #define ARCH_CPU_LITTLE_ENDIAN 1
+#elif defined(__alpha__)
+#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