diff --git a/new-test b/new-test
index 402699c..1adb825 100755
--- a/new-test
+++ b/new-test
@@ -1,5 +1,5 @@
 #!/bin/sh
 set -e
-touch tests/$1.{sh,expected}
+touch tests/${1:?test-name}.{sh,expected}
 ${VISUAL:-${EDITOR:-true}} tests/$1.{sh,expected}
 echo tests/$1.{sh,expected}