diff --git a/crypto/sm2/sm2_sign.c b/crypto/sm2/sm2_sign.c
index 12ccd28bcf..e12eca12fb 100644
--- a/crypto/sm2/sm2_sign.c
+++ b/crypto/sm2/sm2_sign.c
@@ -279,9 +279,7 @@ int SM2_sign(int type, const unsigned char *dgst, int dgstlen,
 
     *siglen = i2d_ECDSA_SIG(s, &sig);
 
-    ECDSA_SIG_free(s);
-
-    ret = 0;
+    ret = 1;
 
  done:
     ECDSA_SIG_free(s);