diff --git a/lib/config/index.js b/lib/config/index.js
index 6bc9a41..bea5a6a 100644
--- a/lib/config/index.js
+++ b/lib/config/index.js
@@ -34,8 +34,8 @@ if (config.ldap.tlsca) {
   let ca = config.ldap.tlsca.split(',')
   let caContent = []
   for (let i of ca) {
-    if (fs.existsSync(ca[i])) {
-      caContent.push(fs.readFileSync(ca[i], 'utf8'))
+    if (fs.existsSync(i)) {
+      caContent.push(fs.readFileSync(i, 'utf8'))
     }
   }
   let tlsOptions = {