diff --git a/tests/stty/stty-pairs.sh b/tests/stty/stty-pairs.sh
index aebbd7fe7..2af9ac78c 100755
--- a/tests/stty/stty-pairs.sh
+++ b/tests/stty/stty-pairs.sh
@@ -38,7 +38,7 @@ stty $(cat $saved_state) || fail=1
 # Don't depend on terminal width.  Put each option on its own line,
 # remove all non-boolean ones, remove 'parenb' and 'cread' explicitly,
 # then remove any leading hyphens.
-sed_del='/^speed/d;/^rows/d;/^columns/d;/ = /d;s/parenb//;s/cread//'
+sed_del='/^[io]*speed/d;/^rows/d;/^columns/d;/ = /d;s/parenb//;s/cread//'
 options=$(stty -a | tr -s ';' '\n' | sed "s/^ //;$sed_del;s/-//g")
 
 # Take them in pairs, with and without the leading '-'.
diff --git a/tests/stty/stty.sh b/tests/stty/stty.sh
index c0f74947a..b224ae41f 100755
--- a/tests/stty/stty.sh
+++ b/tests/stty/stty.sh
@@ -51,7 +51,7 @@ returns_ 1 stty -raw -a 2>/dev/null || fail=1
 # Build a list of all boolean options stty accepts on this system.
 # Don't depend on terminal width.  Put each option on its own line,
 # remove all non-boolean ones, then remove any leading hyphens.
-sed_del='/^speed/d;/^rows/d;/^columns/d;/ = /d'
+sed_del='/^[io]*speed/d;/^rows/d;/^columns/d;/ = /d'
 options=$(stty -a | tr -s ';' '\n' | sed "s/^ //;$sed_del;s/-//g")
 
 # Take them one at a time, with and without the leading '-'.