diff --git a/sim/common/xlen.h b/sim/common/xlen.h
deleted file mode 100644
index 07a75b96..00000000
--- a/sim/common/xlen.h
+++ /dev/null
@@ -1,35 +0,0 @@
-#pragma once
-
-#ifndef XLEN
-#define XLEN 32
-#endif
-
-#ifndef FLEN
-#define FLEN XLEN
-#endif
-
-#if XLEN == 32
-#define uintx_t uint32_t
-#define intx_t int32_t
-#define intm_t int64_t
-#define uintm_t uint64_t
-#elif XLEN == 64
-#define uintx_t uint64_t
-#define intx_t int64_t
-#define intm_t __int128_t
-#define uintm_t __uint128_t
-#else
-#error unsupported XLEN
-#endif
-
-#if FLEN >= XLEN
-#if FLEN == 32
-#define uintf_t uint32_t
-#elif FLEN == 64
-#define uintf_t uint64_t
-#else
-#error unsupported FLEN
-#endif
-#else
-#error unsupported FLEN
-#endif