diff --git a/pulse.c b/pulse.c
index 558895fbb70af487707d88684fca35be79412b62..9d40b3c6cde290b0e556437214c86ef44a1ed3a0 100644
--- a/pulse.c
+++ b/pulse.c
@@ -1449,6 +1449,7 @@ static int pulse_authenticate(struct openconnect_info *vpninfo, int connecting)
 	}
 	if (bytes[0])
 		buf_append(reqbuf, " clientIp=%s", bytes);
+	buf_append(reqbuf, " clientCapabilities={}");
 	buf_append(reqbuf, "\n%c", 0);
 	ret = send_ift_packet(vpninfo, reqbuf);
 	if (ret)