diff --git a/common/oatbox/filesystem/File.php b/common/oatbox/filesystem/File.php
index e7bc64cf3..d2bf57b39 100644
--- a/common/oatbox/filesystem/File.php
+++ b/common/oatbox/filesystem/File.php
@@ -104,8 +104,10 @@ public function write($mixed, $mimeType = null)
                 }
                 $this->getFileSystem()->writeStream($this->getPrefix(), $resource, $config);
             } else {
-                throw new \InvalidArgumentException('Value to be written has to be: string, resource or StreamInterface, ' .
-                    '"' . gettype($mixed) . '" given.');
+                throw new \InvalidArgumentException(sprintf(
+                    'Value to be written has to be: string, resource or StreamInterface, "%s" given.',
+                    gettype($mixed)
+                ));
             }
         } catch (FilesystemException $e) {
             return false;