diff --git a/src/channel.c b/src/channel.c
index 5181f6f..63e5d5b 100644
--- a/src/channel.c
+++ b/src/channel.c
@@ -1418,7 +1418,7 @@ _libssh2_channel_flush(LIBSSH2_CHANNEL *channel, int streamid)
 
         rc = _libssh2_channel_receive_window_adjust(channel,
                                                     channel->flush_refund_bytes,
-                                                    0, NULL);
+                                                    1, NULL);
         if (rc == LIBSSH2_ERROR_EAGAIN)
             return rc;
     }
diff --git a/src/packet.c b/src/packet.c
index 5852d0c..364b434 100644
--- a/src/packet.c
+++ b/src/packet.c
@@ -661,7 +661,7 @@ _libssh2_packet_add(LIBSSH2_SESSION * session, unsigned char *data,
                 rc = _libssh2_channel_receive_window_adjust(session->
                                                             packAdd_channelp,
                                                             datalen - 13,
-                                                            0, NULL);
+                                                            1, NULL);
                 if (rc == LIBSSH2_ERROR_EAGAIN)
                     return rc;
 
diff --git a/src/sftp.c b/src/sftp.c
index 6d73751..96e00aa 100644
--- a/src/sftp.c
+++ b/src/sftp.c
@@ -285,7 +285,7 @@ sftp_packet_read(LIBSSH2_SFTP *sftp)
                 /* ask for twice the data amount we need at once */
                 rc = _libssh2_channel_receive_window_adjust(channel,
                                                             sftp->partial_len*2,
-                                                            0, NULL);
+                                                            1, NULL);
                 /* store the state so that we continue with the correct
                    operation at next invoke */
                 sftp->packet_state = (rc == LIBSSH2_ERROR_EAGAIN)?
@@ -1262,7 +1262,7 @@ static ssize_t sftp_read(LIBSSH2_SFTP_HANDLE * handle, char *buffer,
 
                 rc = _libssh2_channel_receive_window_adjust(sftp->channel,
                                                             max_read_ahead*8,
-                                                            0, NULL);
+                                                            1, NULL);
                 /* if this returns EAGAIN, we will get back to this function
                    at next call */
                 assert(rc != LIBSSH2_ERROR_EAGAIN || !filep->data_left);