diff --git a/drivers/189/util.go b/drivers/189/util.go
index dd79ae76..bcaeb611 100644
--- a/drivers/189/util.go
+++ b/drivers/189/util.go
@@ -122,6 +122,7 @@ func EncodeParam(v url.Values) string {
 }
 
 func encode(str string) string {
+	str = strings.ReplaceAll(str, "%", "%25")
 	str = strings.ReplaceAll(str, "&", "%26")
 	str = strings.ReplaceAll(str, "+", "%2B")
 	return str