diff --git a/appl/kx/rxtelnet.in b/appl/kx/rxtelnet.in
index 9db19a3bd..95593b58a 100644
--- a/appl/kx/rxtelnet.in
+++ b/appl/kx/rxtelnet.in
@@ -8,6 +8,6 @@ host=$1
 prefix=@prefix@
 exec_prefix=@exec_prefix@
 set `@bindir@/kx $host`
-disp=$1
+disp=:$1
 auth=$2
-xterm -T $host -n $host -e "env DISPLAY=$disp XAUTHORITY=$auth @bindir@/telnet -D $host" &
+xterm -T $host -n $host -e env DISPLAY=$disp XAUTHORITY=$auth @bindir@/telnet -D $host &
diff --git a/appl/kx/rxterm.in b/appl/kx/rxterm.in
index 28642736e..9c8dce830 100644
--- a/appl/kx/rxterm.in
+++ b/appl/kx/rxterm.in
@@ -8,6 +8,6 @@ host=$1
 prefix=@prefix@
 exec_prefix=@exec_prefix@
 set `@bindir@/kx $host`
-disp=$1
+disp=:$1
 auth=$2
 @bindir@/rsh -n $host "env DISPLAY=$disp XAUTHORITY=$auth xterm -T $host -n $host &"