diff --git a/crypto/sm2/sm2_sign.c b/crypto/sm2/sm2_sign.c
index e594ffd10a0bb29976bd42e1e492591e27d2b43e..0f9c14cb5f4c1fdee38a5dda7de2391a2bcb6312 100644
--- a/crypto/sm2/sm2_sign.c
+++ b/crypto/sm2/sm2_sign.c
@@ -12,6 +12,7 @@
 #include "internal/sm2.h"
 #include "internal/sm2err.h"
 #include "internal/ec_int.h" /* ec_group_do_inverse_ord() */
+#include "internal/numbers.h"
 #include <openssl/err.h>
 #include <openssl/evp.h>
 #include <openssl/err.h>