1 files changed, 1 insertions, 1 deletions
diff --git a/lib/ssluse.h b/lib/ssluse.h
index d5424d5a6..9707c0581 100644
--- a/lib/ssluse.h
+++ b/lib/ssluse.h
@@ -58,7 +58,7 @@ void Curl_ossl_cleanup(void);
 
 ssize_t Curl_ossl_send(struct connectdata *conn,
                        int sockindex,
-                       void *mem,
+                       const void *mem,
                        size_t len);
 ssize_t Curl_ossl_recv(struct connectdata *conn, /* connection data */
                        int num,                  /* socketindex */