diff --git a/packages/mosaic/framework/tools/tmux/test-send-message-verdict.sh b/packages/mosaic/framework/tools/tmux/test-send-message-verdict.sh
index e50d9f79..00b2ce43 100755
--- a/packages/mosaic/framework/tools/tmux/test-send-message-verdict.sh
+++ b/packages/mosaic/framework/tools/tmux/test-send-message-verdict.sh
@@ -56,7 +56,7 @@ tmux -L "$SOCKET" new-session -d -s noglyph -c "$TMP" \
   'PS1="sh-noglyph$ " exec bash --noprofile --norc -i'
 sleep 0.3
 out=$("$SEND" -L "$SOCKET" -t "=noglyph" -m "verdict fixture two must fail loud" 2>"$TMP/e2"); rc=$?
-if [ "$rc" -eq 0 ] && printf '%s' "$out" | grep -qF "✓ delivered"; then
+if [ "$rc" -eq 0 ] && grep -qF "✓ delivered" <<<"$out"; then
   ok "delivered: glyphless pane that submits => exit 0 (runtime-agnostic, E7 FIXED)"
 else
   no "delivered: glyphless pane that submits => exit 0" "rc=$rc out=[$out] err=[$(cat "$TMP/e2")]"