diff --git a/crypto/aes/aes_core.c b/crypto/aes/aes_core.c
index d9f9ca815..bd5c7793b 100644
--- a/crypto/aes/aes_core.c
+++ b/crypto/aes/aes_core.c
@@ -629,7 +629,7 @@ static const u32 rcon[] = {
 /**
  * Expand the cipher key into the encryption key schedule.
  */
-int AES_set_encrypt_key(const unsigned char *userKey, int bits,   
+int AES_set_encrypt_key(const unsigned char *userKey, const int bits,
                         AES_KEY *key)
 {
 
diff --git a/include/openssl/aes.h b/include/openssl/aes.h
index a2dff58f1..245c552ab 100644
--- a/include/openssl/aes.h
+++ b/include/openssl/aes.h
@@ -40,7 +40,7 @@ typedef struct aes_key_st AES_KEY;
 
 const char *AES_options(void);
 
-int AES_set_encrypt_key(const unsigned char *userKey, const unsigned int bits,
+int AES_set_encrypt_key(const unsigned char *userKey, const int bits,
                         AES_KEY *key);
 int AES_set_decrypt_key(const unsigned char *userKey, const int bits,
                         AES_KEY *key);