diff --git a/VAX/tests/vax-diag_test.ini b/VAX/tests/vax-diag_test.ini
index cd8adb16..fa70a85b 100644
--- a/VAX/tests/vax-diag_test.ini
+++ b/VAX/tests/vax-diag_test.ini
@@ -20,7 +20,7 @@
 cd %~p0
 set env DIAG_QUIET_MODE=0
 if ("%1" == "-v") set console notelnet
-else set -qu console telnet=65432,telnet=buffered; set env -a DIAG_QUIET_MODE=1
+else set -qu console telnet=localhost:65432,telnet=buffered; set env -a DIAG_QUIET_MODE=1
 goto DIAG_%SIM_BIN_NAME%
 
 :DIAG_MICROVAX2