diff --git a/src/server/testsuite/config/unix.exp b/src/server/testsuite/config/unix.exp
index e302770b24696dd34354cc95e85bff030fbdf23e..41a0a1d9bb9bfae2d93d06754f01a56fd42bb607 100644
--- a/src/server/testsuite/config/unix.exp
+++ b/src/server/testsuite/config/unix.exp
@@ -53,7 +53,7 @@ set clientport 53262
 set aux_item_default_conf_file "$top_srcdir/run-support/aux-items.conf"
 
 # Fix the tty settings for minimum impact on the data flow.
-set stty_init "-echo -onlcr -istrip -isig erase ^- kill ^- werase ^-"
+set stty_init "-echo -onlcr -istrip -isig erase '^-' kill '^-' werase '^-'"
 
 # State variables.
 set line_leader ""