diff --git a/tools/development/bump_version_set_code_name.sh b/tools/development/bump_version_set_code_name.sh
index eb9f24c2d..273680d1a 100755
--- a/tools/development/bump_version_set_code_name.sh
+++ b/tools/development/bump_version_set_code_name.sh
@@ -2,7 +2,7 @@
 
 set -e
 
-if [[ ( -z $1 ) || ( -z $2 ) ]]; then
+if (( ${#@} != 2 )); then
   echo Usage: mkvver newver codename
   exit 1
 fi