diff --git a/doc/crypto/EVP_EncryptInit.pod b/doc/crypto/EVP_EncryptInit.pod
index dc9a2d76c5..4cd24d7e01 100644
--- a/doc/crypto/EVP_EncryptInit.pod
+++ b/doc/crypto/EVP_EncryptInit.pod
@@ -40,14 +40,14 @@ EVP_aes_128_cbc_hmac_sha256, EVP_aes_256_cbc_hmac_sha256
  int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,
 	 ENGINE *impl, unsigned char *key, unsigned char *iv);
  int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
-         int *outl, unsigned char *in, int inl);
+         int *outl, const unsigned char *in, int inl);
  int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out,
          int *outl);
 
  int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,
 	 ENGINE *impl, unsigned char *key, unsigned char *iv);
  int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
-         int *outl, unsigned char *in, int inl);
+         int *outl, const unsigned char *in, int inl);
  int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *outm,
          int *outl);