diff --git a/makeicecat b/makeicecat
index 60dab84..8dc5d11 100755
--- a/makeicecat
+++ b/makeicecat
@@ -130,14 +130,14 @@ validate_env()
     fi
 
     # verify that Perl 'rename' is available and sufficent
-    rename_cmds=(
+    local rename_cmds=(
         # NOTE: order is important -- 'util-linux' provides a binary named 'rename'
         # TODO: consider removing this dependency and using GNU find
         'rename'      # guix
         'perl-rename' # arch derivatives
         'prename'     # debian derivatives
     )
-    local found_ver
+    local rename_cmd
     local required_ver
     for rename_cmd in ${rename_cmds[@]}
     do which ${rename_cmd} &> /dev/null && RENAME_CMD=${rename_cmd}