diff --git a/wp-includes/class-http.php b/wp-includes/class-http.php
index ee08e424c..b5075cc32 100644
--- a/wp-includes/class-http.php
+++ b/wp-includes/class-http.php
@@ -240,6 +240,9 @@ class WP_Http {
 
 		$arrURL = parse_url($url);
 
+		if ( empty( $url ) || empty($url['scheme'] ) )
+			return new WP_Error('http_request_failed', __('A valid URL was not provided.'));
+
 		if ( $this->block_request( $url ) )
 			return new WP_Error('http_request_failed', __('User has blocked requests through HTTP.'));