diff --git a/lib/private/largefilehelper.php b/lib/private/largefilehelper.php
index 2c35feefc8bfec25cead173d1a2071c6393acaa7..d5b7946feff9ba1c9e9117a73be1c13e6a925220 100644
--- a/lib/private/largefilehelper.php
+++ b/lib/private/largefilehelper.php
@@ -101,7 +101,8 @@ class LargeFileHelper {
 	*/
 	public function getFileSizeViaCurl($filename) {
 		if (function_exists('curl_init')) {
-			$ch = curl_init("file://$filename");
+			$fencoded = urlencode($filename);
+			$ch = curl_init("file://$fencoded");
 			curl_setopt($ch, CURLOPT_NOBODY, true);
 			curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 			curl_setopt($ch, CURLOPT_HEADER, true);