diff --git a/src/Api/Crawl.php b/src/Api/Crawl.php
index b0a5a48..b43d2e9 100644
--- a/src/Api/Crawl.php
+++ b/src/Api/Crawl.php
@@ -502,7 +502,7 @@ public function buildUrl()
 
             // Add seeds
             if (!empty($this->seeds)) {
-                $url .= '&seeds=' . implode(' ', array_map(function ($item) {
+                $url .= '&seeds=' . implode('%20', array_map(function ($item) {
                     return urlencode($item);
                 }, $this->seeds));
             }
@@ -569,4 +569,4 @@ protected function getApiString()
 
         return urlencode($this->api->buildUrl());
     }
-}
\ No newline at end of file
+}