diff --git a/doc/crypto/EVP_EncryptInit.pod b/doc/crypto/EVP_EncryptInit.pod
index 17bd7a99c6fc5..f842eeaf7d29f 100644
--- a/doc/crypto/EVP_EncryptInit.pod
+++ b/doc/crypto/EVP_EncryptInit.pod
@@ -47,14 +47,14 @@ EVP_chacha20, EVP_chacha20_poly1305 - EVP cipher routines
  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);