diff --git a/env.sh.example b/env.sh.example
index 30caaf7..27df88c 100644
--- a/env.sh.example
+++ b/env.sh.example
@@ -10,7 +10,7 @@ export USE_SSL='true'
 
 ## Do not change the following part
 jdbc_url="jdbc:mysql://${TIDB_HOST}:${TIDB_PORT}/${TIDB_DB_NAME}"
-if [ 'true'=="${USE_SSL}" ]; then
+if [ 'true' == "${USE_SSL}" ]; then
   jdbc_url="${jdbc_url}?sslMode=VERIFY_IDENTITY&enabledTLSProtocols=TLSv1.2,TLSv1.3"
 fi