diff --git a/history-search-multi-word.plugin.zsh b/history-search-multi-word.plugin.zsh
index bec42c2..1046b45 100644
--- a/history-search-multi-word.plugin.zsh
+++ b/history-search-multi-word.plugin.zsh
@@ -4,11 +4,7 @@
 # to ~/.zshrc.
 #
 
-# This gives immunity to functionargzero being unset
-# _ will be set to last argument to source builtin
-PLUGIN_UNDERSCORE="$_"
-[ "$0" != "$PLUGIN_UNDERSCORE" ] && 0="$PLUGIN_UNDERSCORE"
-
+0="${(%):-%N}" # this gives immunity to functionargzero being unset
 REPO_DIR="${0%/*}"
 if [[ -z "$ZPLG_CUR_PLUGIN" && "${fpath[(r)$REPO_DIR]}" != $REPO_DIR ]]; then
     fpath+=( "$REPO_DIR" )