diff --git a/plugin/antiabuse/db.go b/plugin/antiabuse/db.go
index 09af2a67..aa80d800 100644
--- a/plugin/antiabuse/db.go
+++ b/plugin/antiabuse/db.go
@@ -24,7 +24,7 @@ func (db *antidb) isInAntiList(uid, gid int64, msg string) bool {
 	grp := strconv.FormatInt(gid, 36)
 	db.RLock()
 	defer db.RUnlock()
-	return db.CanFind(grp, "WHERE instr('"+msg+"', word)>=0")
+	return db.CanFind(grp, "WHERE instr('"+msg+"', word)>0")
 }
 
 func (db *antidb) insertWord(gid int64, word string) error {