diff --git a/crypto/serpent/serpent.c b/crypto/serpent/serpent.c
index 12923370..d6142d9e 100644
--- a/crypto/serpent/serpent.c
+++ b/crypto/serpent/serpent.c
@@ -76,7 +76,7 @@ POSSIBILITY OF SUCH DAMAGE. */
 #include <string.h>
 #include <openssl/crypto.h>
 #include <openssl/serpent.h>
-
+#include "serpent_locl.h"
 
 static void serpent_whiten(serpent_blk *dst, serpent_key_t *src, int idx) {
 	uint8_t i;