diff --git a/doc/man3/BIO_ctrl.pod b/doc/man3/BIO_ctrl.pod
index 2e438c3ce9528..a87abc7994d59 100644
--- a/doc/man3/BIO_ctrl.pod
+++ b/doc/man3/BIO_ctrl.pod
@@ -16,7 +16,7 @@ BIO_get_info_callback, BIO_set_info_callback, BIO_info_cb
 
  long BIO_ctrl(BIO *bp, int cmd, long larg, void *parg);
  long BIO_callback_ctrl(BIO *b, int cmd, BIO_info_cb *cb);
- char *BIO_ptr_ctrl(BIO *bp, int cmd, long larg);
+ void *BIO_ptr_ctrl(BIO *bp, int cmd, long larg);
  long BIO_int_ctrl(BIO *bp, int cmd, long larg, int iarg);
 
  int BIO_reset(BIO *b);