diff --git a/hako2epub.py b/hako2epub.py
index db4447a..5020d74 100644
--- a/hako2epub.py
+++ b/hako2epub.py
@@ -564,7 +564,7 @@ def update_epub(self, ln, volume):
         epub_folder = Utils().format_name(ln.name)
         epub_path = epub_folder + '/' + epub_name
 
-        if isdir(epub_path):
+        if isfile(epub_path):
             try:
                 self.book = epub.read_epub(epub_path)
             except Exception: