diff --git a/wolfssl/wolfcrypt/types.h b/wolfssl/wolfcrypt/types.h
index df8e9f6f5..2afc82b8c 100755
--- a/wolfssl/wolfcrypt/types.h
+++ b/wolfssl/wolfcrypt/types.h
@@ -101,7 +101,7 @@
     #if (defined(__alpha__) || defined(__ia64__) || defined(_ARCH_PPC64) || \
          defined(__mips64)  || defined(__x86_64__) || defined(_M_X64)) || \
          defined(__aarch64__) || defined(__sparc64__) || \
-        (defined(__SIZEOF_POINTER__) && (__SIZEOF_POINTER__ == 8))
+        (defined(__riscv_xlen) && (__riscv_xlen == 64))
         typedef word64 wolfssl_word;
         #define WC_64BIT_CPU
     #elif (defined(sun) || defined(__sun)) && \