diff --git a/crypto/sm2/sm2_standard_sign.c b/crypto/sm2/sm2_standard_sign.c
index e0912847..e74fbe67 100644
--- a/crypto/sm2/sm2_standard_sign.c
+++ b/crypto/sm2/sm2_standard_sign.c
@@ -1,5 +1,4 @@
 #include "openssl/sm2_standard_sign.h"
-#include "openssl/kdf_standard_sign.h"
 
 
 /* Initiate SM2 curve */