diff --git a/include/openssl/kdf_standard_exch.h b/include/openssl/kdf_standard_exch.h
index 61655e91..a36fd702 100644
--- a/include/openssl/kdf_standard_exch.h
+++ b/include/openssl/kdf_standard_exch.h
@@ -1,5 +1,4 @@
 #include <string.h>
-#include "sm2_standard_exch.h"
 
 
 #define SM3_len 256
@@ -14,6 +13,10 @@
 #define SM3_IVG 0xe38dee4d
 #define SM3_IVH 0xb0fb0e4e
 
+#define SM2_WORDSIZE 8
+#define SM2_NUMBITS 256
+#define SM2_NUMWORD (SM2_NUMBITS / SM2_WORDSIZE)	//32
+
 
 /* Various logical functions */
 #define SM3_p1(x) (x ^ SM3_rotl32(x, 15) ^ SM3_rotl32(x, 23))