diff --git a/antigen.zsh b/antigen.zsh
index f37c9a5..1cca2bc 100644
--- a/antigen.zsh
+++ b/antigen.zsh
@@ -19,10 +19,11 @@ antigen-bundle () {
     local btype=plugin
 
     # Set spec values based on the positional arguments.
-    local position_args='url loc'
+    local position_args
+    position_args=(url loc)
     local i=1
     while ! [[ -z $1 || $1 == --*=* ]]; do
-        local arg_name="$(echo "$position_args" | cut -d\  -f$i)"
+        local arg_name="${position_args[$i]}"
         local arg_value="$1"
         eval "local $arg_name='$arg_value'"
         shift