diff --git a/apps/files_external/lib/google.php b/apps/files_external/lib/google.php
index 36b890e82e..f8675cbe22 100644
--- a/apps/files_external/lib/google.php
+++ b/apps/files_external/lib/google.php
@@ -251,7 +251,7 @@ class Google extends \OC\Files\Storage\Common {
 				// Check if this is a Google Doc
 				if ($this->getMimeType($path) !== $file->getMimeType()) {
 					// Return unknown file size
-					$stat['size'] = \OC\Files\Filesystem::FREE_SPACE_UNKNOWN;
+					$stat['size'] = \OC\Files\FREE_SPACE_UNKNOWN;
 				} else {
 					$stat['size'] = $file->getFileSize();
 				}