diff --git a/doc/man3/OSSL_CMP_CTX_new.pod b/doc/man3/OSSL_CMP_CTX_new.pod
index 040be8e167..9c1aa6f88a 100644
--- a/doc/man3/OSSL_CMP_CTX_new.pod
+++ b/doc/man3/OSSL_CMP_CTX_new.pod
@@ -120,7 +120,7 @@ OSSL_CMP_CTX_set1_senderNonce
  int OSSL_CMP_CTX_set1_referenceValue(OSSL_CMP_CTX *ctx,
                                       const unsigned char *ref, int len);
  int OSSL_CMP_CTX_set1_secretValue(OSSL_CMP_CTX *ctx,
-                                   const unsigned char *sec, const int len);
+                                   const unsigned char *sec, int len);
 
  /* CMP message header and extra certificates: */
  int OSSL_CMP_CTX_set1_recipient(OSSL_CMP_CTX *ctx, const X509_NAME *name);
diff --git a/include/openssl/cmp.h.in b/include/openssl/cmp.h.in
index 0ac7f5b040..32360120c2 100644
--- a/include/openssl/cmp.h.in
+++ b/include/openssl/cmp.h.in
@@ -330,7 +330,7 @@ int OSSL_CMP_CTX_set1_pkey(OSSL_CMP_CTX *ctx, EVP_PKEY *pkey);
 int OSSL_CMP_CTX_set1_referenceValue(OSSL_CMP_CTX *ctx,
                                      const unsigned char *ref, int len);
 int OSSL_CMP_CTX_set1_secretValue(OSSL_CMP_CTX *ctx,
-                                  const unsigned char *sec, const int len);
+                                  const unsigned char *sec, int len);
 /* CMP message header and extra certificates: */
 int OSSL_CMP_CTX_set1_recipient(OSSL_CMP_CTX *ctx, const X509_NAME *name);
 int OSSL_CMP_CTX_push0_geninfo_ITAV(OSSL_CMP_CTX *ctx, OSSL_CMP_ITAV *itav);