diff --git a/regress/copy-mode-exit-status.sh b/regress/copy-mode-exit-status.sh
new file mode 100644
index 000000000..5dbbc6ced
--- /dev/null
+++ b/regress/copy-mode-exit-status.sh
@@ -0,0 +1,80 @@
+#!/bin/sh
+
+# Check OSC 133 exit status indicators in copy mode using a real client.
+
+PATH=/bin:/usr/bin
+TERM=screen
+LC_ALL=C.UTF-8
+export TERM LC_ALL
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+TMUX="$TEST_TMUX -LtestA$$ -f/dev/null"
+TMUX2="$TEST_TMUX -LtestB$$ -f/dev/null"
+
+fail() {
+	echo "$*" >&2
+	exit 1
+}
+
+capture() {
+	$TMUX capture-pane -pS0 -E- >$TMP || exit 1
+}
+
+check_grep() {
+	grep -Fq "$1" $TMP || fail "missing pattern: $1"
+}
+
+check_no_grep() {
+	grep -Fq "$1" $TMP && fail "unexpected pattern: $1"
+}
+
+$TMUX kill-server 2>/dev/null
+$TMUX2 kill-server 2>/dev/null
+
+TMP=$(mktemp)
+trap "rm -f $TMP; $TMUX kill-server 2>/dev/null; $TMUX2 kill-server 2>/dev/null" 0 1 15
+
+$TMUX2 new-session -d -x80 -y10 \
+	"printf '\033]133;A\007p\$ \033]133;B\007one\n\033]133;C\007out1\n\033]133;D;0\007\033]133;A\007p\$ \033]133;B\007two\n\033]133;C\007out2\n\033]133;D;123\007\033]133;A\007p\$ \033]133;B\007three\n\033]133;C\007out3\n\033]133;D\007\033]133;A\007p\$ \033]133;B\007'; exec sleep 100" || \
+	exit 1
+$TMUX2 set -g status off || exit 1
+$TMUX2 set -g copy-mode-position-format '#[align=left]POS' || exit 1
+
+$TMUX new-session -d -x80 -y10 || exit 1
+$TMUX set -g status off || exit 1
+$TMUX send -l "$TMUX2 attach" || exit 1
+$TMUX send Enter || exit 1
+sleep 1
+
+$TMUX2 copy-mode -U || exit 1
+$TMUX2 send -X history-top || exit 1
+sleep 1
+capture
+check_grep "!- p\$ two"
+check_grep "POS"
+
+# Rebuilding with collapsed output must not expand copy-mode formats before
+# the viewport has been restored for the shorter backing grid.
+$TMUX2 send -X collapse-output -a || exit 1
+sleep 1
+capture
+check_grep "!+ p\$ two"
+
+# A format wider than the standard three-column gutter is not truncated.
+$TMUX2 send -X cancel || exit 1
+$TMUX2 set -g copy-mode-exit-status-format \
+	'#[align=right]#{?exit_status,!#{exit_status}, }' || exit 1
+$TMUX2 copy-mode -c || exit 1
+$TMUX2 send -X history-top || exit 1
+sleep 1
+capture
+check_grep "!123+ p\$ two"
+
+$TMUX2 send -X select-line || exit 1
+$TMUX2 send -X copy-selection || exit 1
+selection=$($TMUX2 show-buffer)
+case $selection in
+*RC=*) fail "exit status was copied" ;;
+esac
+
+exit 0