diff --git a/main.py b/main.py
index 06f47e8..6f714ed 100644
--- a/main.py
+++ b/main.py
@@ -52,7 +52,8 @@ def done(self, job):
 
         # send files to device
         for book_id in self.ids:
-            data = check_metadata(self.gui.current_db.new_api, book_id)
+            data = check_metadata(self.gui.current_db.new_api,
+                                  book_id, False)
             if data is None:
                 continue
             send(self.gui, (book_id, ) + data)
diff --git a/metadata.py b/metadata.py
index 385b4c1..0d1cea7 100644
--- a/metadata.py
+++ b/metadata.py
@@ -8,7 +8,7 @@
 from calibre_plugins.worddumb.asin import get_asin
 
 
-def check_metadata(db, book_id):
+def check_metadata(db, book_id, update_exth=True):
     # Get the current metadata for this book from the db
     mi = db.get_metadata(book_id)
     fmts = db.formats(book_id)
@@ -41,7 +41,7 @@ def check_metadata(db, book_id):
         mi.set_identifier('mobi-asin', asin)
         db.set_metadata(book_id, mi)
 
-    if fmt.lower() in ['mobi', 'azw3']:
+    if fmt.lower() in ['mobi', 'azw3'] and update_exth:
         with open(book_path, 'r+b') as stream:
             mu = UpdateMobiEXTH(stream)
             mu.update(mi, asin)