diff --git a/zsh-fzf-history-search.zsh b/zsh-fzf-history-search.zsh
index f813e0c..6e40fa7 100644
--- a/zsh-fzf-history-search.zsh
+++ b/zsh-fzf-history-search.zsh
@@ -68,7 +68,7 @@ fzf_history_search() {
 
   local ret=$?
   if [ -n "$candidates" ]; then
-    if (( ! $CANDIDATE_LEADING_FIELDS == 1 )); then
+    if (( $CANDIDATE_LEADING_FIELDS != 1 )); then
       BUFFER="${candidates[@]/(#m)[0-9 \-\:]##/$(
       printf '%s' "${${(As: :)MATCH}[${CANDIDATE_LEADING_FIELDS},-1]}" | sed 's/%/%%/g'
       )}"