diff --git a/src/Curl/Curl.php b/src/Curl/Curl.php
index aca8ab7..a1bb042 100644
--- a/src/Curl/Curl.php
+++ b/src/Curl/Curl.php
@@ -309,7 +309,7 @@ class Curl
             if (is_file($download_filename) && $filesize = filesize($download_filename)) {
                 $first_byte_position = $filesize;
                 $range = $first_byte_position . '-';
-                $this->setOpt(CURLOPT_RANGE, $range);
+                $this->setRange($range);
                 $this->fileHandle = fopen($download_filename, 'ab');
             } else {
                 $this->fileHandle = fopen($download_filename, 'wb');
diff --git a/src/Curl/MultiCurl.php b/src/Curl/MultiCurl.php
index 813370d..0df861b 100644
--- a/src/Curl/MultiCurl.php
+++ b/src/Curl/MultiCurl.php
@@ -102,7 +102,7 @@ class MultiCurl
             if (is_file($download_filename) && $filesize = filesize($download_filename)) {
                 $first_byte_position = $filesize;
                 $range = $first_byte_position . '-';
-                $curl->setOpt(CURLOPT_RANGE, $range);
+                $curl->setRange($range);
                 $curl->fileHandle = fopen($download_filename, 'ab');
 
                 // Move the downloaded temporary file to the destination save path.