diff --git a/zsh-fzf-history-search.zsh b/zsh-fzf-history-search.zsh
index 7eaf9fd..b8f3310 100644
--- a/zsh-fzf-history-search.zsh
+++ b/zsh-fzf-history-search.zsh
@@ -59,7 +59,7 @@ fzf_history_search() {
   candidates=(${(f)"$(eval $history_cmd | fzf ${=ZSH_FZF_HISTORY_SEARCH_FZF_ARGS} ${=ZSH_FZF_HISTORY_SEARCH_FZF_EXTRA_ARGS} -q "$BUFFER")"})
   local ret=$?
   if [ -n "$candidates" ]; then
-    if (( ! $CANDIDATE_LEADING_FIELDS == 1 )); then
+    if (( $CANDIDATE_LEADING_FIELDS != 1 )); then
       BUFFER="${candidates[@]/(#m)[0-9 \-\:]##/${${(As: :)MATCH}[${CANDIDATE_LEADING_FIELDS},-1]}}"
     else
       BUFFER="${candidates[@]}"