diff --git a/crypto/sm2/build.info b/crypto/sm2/build.info
index 6b650d73..8dcca88e 100644
--- a/crypto/sm2/build.info
+++ b/crypto/sm2/build.info
@@ -1,3 +1,3 @@
 LIBS=../../libcrypto
 SOURCE[../../libcrypto]=sm2_err.c sm2_asn1.c sm2_id.c sm2_sign.c sm2_enc.c \
-			sm2_oct.c sm2_exch.c sm2_kmeth.c
+			sm2_oct.c sm2_exch.c sm2_kmeth.c sm2_cosign.c