diff --git a/docs/libssh2_base64_decode.3 b/docs/libssh2_base64_decode.3
index e46db823..7a67202d 100644
--- a/docs/libssh2_base64_decode.3
+++ b/docs/libssh2_base64_decode.3
@@ -1,6 +1,6 @@
 .\" Copyright (C) The libssh2 project and its contributors.
 .\" SPDX-License-Identifier: BSD-3-Clause
-.TH libssh2_base64_decode 3 "23 Dec 2008" "libssh2 1.0" "libssh2"
+.TH libssh2_base64_decode 3 "23 Dec 2008" "libssh2 0.1" "libssh2"
 .SH NAME
 libssh2_base64_decode - decode a base64 encoded string
 .SH SYNOPSIS
@@ -13,8 +13,8 @@ libssh2_base64_decode(LIBSSH2_SESSION *session, char **dest,
                       unsigned int src_len);
 .fi
 .SH DESCRIPTION
-This function is deemed DEPRECATED and will be removed from libssh2 in a
-future version. Do not use it!
+This function is deemed DEPRECATED in 1.0 and will be removed from libssh2
+in a future version. Do not use it!
 
 Decode a base64 chunk and store it into a newly allocated buffer. 'dest_len'
 will be set to hold the length of the returned buffer that '*dest' will point
diff --git a/include/libssh2.h b/include/libssh2.h
index ecfa1a9d..78cc3122 100644
--- a/include/libssh2.h
+++ b/include/libssh2.h
@@ -1071,10 +1071,12 @@ LIBSSH2_API LIBSSH2_CHANNEL *
 libssh2_scp_send64(LIBSSH2_SESSION *session, const char *path, int mode,
                    libssh2_int64_t size, time_t mtime, time_t atime);
 
-/* DEPRECATED */
+#ifndef LIBSSH2_NO_DEPRECATED
+LIBSSH2_DEPRECATED(1.0, "")
 LIBSSH2_API int libssh2_base64_decode(LIBSSH2_SESSION *session, char **dest,
                                       unsigned int *dest_len,
                                       const char *src, unsigned int src_len);
+#endif
 
 LIBSSH2_API
 const char *libssh2_version(int req_version_num);
diff --git a/os400/libssh2rpg/libssh2.rpgle.in b/os400/libssh2rpg/libssh2.rpgle.in
index ea0c69fa..4ecc36fd 100644
--- a/os400/libssh2rpg/libssh2.rpgle.in
+++ b/os400/libssh2rpg/libssh2.rpgle.in
@@ -1429,7 +1429,7 @@
      d  mode                               value like(libssh2_Cint)
      d  size                               value like(libssh2_int64_t)
 
-      * DEPRECATED
+      /if not defined(LIBSSH2_NO_DEPRECATED)
      d libssh2_base64_decode...
      d                 pr                  extproc('libssh2_base64_decode')
      d                                     like(libssh2_Cint)
@@ -1438,6 +1438,7 @@
      d  dest_len                       *   value                                unsigned int *
      d  src                            *   value options(*string)               const char *
      d  src_len                            value like(libssh2_Cuint)
+      /endif
 
       * Procedure libssh2_version renamed to avoid upper/lower case name clash.
      d libssh2_get_version...
diff --git a/src/misc.c b/src/misc.c
index cd9971a5..ee798403 100644
--- a/src/misc.c
+++ b/src/misc.c
@@ -353,9 +353,10 @@ static const short base64_reverse_table[256] = {
     -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
 };
 
-/* libssh2_base64_decode
+#ifndef LIBSSH2_NO_DEPRECATED
+/* libssh2_base64_decode (DEPRECATED, DO NOT USE!)
  *
- * Legacy public function. DEPRECATED.
+ * Legacy public function.
  */
 LIBSSH2_API int
 libssh2_base64_decode(LIBSSH2_SESSION *session, char **data,
@@ -372,6 +373,7 @@ libssh2_base64_decode(LIBSSH2_SESSION *session, char **data,
 
     return rc;
 }
+#endif
 
 /* _libssh2_base64_decode
  *