diff --git a/core/lexicon/en/source.inc.php b/core/lexicon/en/source.inc.php
index 67adc8ed5d..5d26fdaabd 100644
--- a/core/lexicon/en/source.inc.php
+++ b/core/lexicon/en/source.inc.php
@@ -86,3 +86,4 @@
 $_lang['PNG'] = 'PNG';
 $_lang['JPG'] = 'JPG';
 $_lang['GIF'] = 'GIF';
+$_lang['WebP'] = 'WebP';