diff --git a/chrome/locale/en-US/zotero/zotero.properties b/chrome/locale/en-US/zotero/zotero.properties
index 0cd1afac6d..78b0adbc6b 100644
--- a/chrome/locale/en-US/zotero/zotero.properties
+++ b/chrome/locale/en-US/zotero/zotero.properties
@@ -1449,6 +1449,7 @@ pdfReader.epubAppearance.letterSpacing.revert = Use default letter spacing
 pdfReader.epubAppearance.pageWidth.revert = Use default page width
 pdfReader.convertToHighlight = Convert to Highlight
 pdfReader.convertToUnderline = Convert to Underline
+pdfReader.size = Size
 
 spellCheck.checkSpelling = Check Spelling
 spellCheck.addRemoveDictionaries = Add/Remove Dictionaries…