1 files changed, 9 insertions, 1 deletions
diff --git a/etc/turboboost.sh b/etc/turboboost.sh
index f336660ec..69c5ba054 100755
--- a/etc/turboboost.sh
+++ b/etc/turboboost.sh
@@ -1,8 +1,16 @@
 #!/bin/sh
 set -eu
 
+usage() {
+  echo "USAGE: $0 <on|off>" ; exit 111
+}
+
+if [ "$#" -eq 0 ]; then
+  usage
+fi
+
 case $1 in
   on) echo 0 > /sys/devices/system/cpu/intel_pstate/no_turbo ;;
   off) echo 1 > /sys/devices/system/cpu/intel_pstate/no_turbo ;;
-  *) echo "USAGE: $0 <on|off>" ; exit 111
+  *) usage
 esac