diff --git a/src/book.py b/src/book.py
index ae5e6ea..e72f97c 100644
--- a/src/book.py
+++ b/src/book.py
@@ -351,6 +351,8 @@ class Book:
                 face = re.sub(r",[\w,\- ]*$", "", face)
                 if face != self.DEFAULT_FONT_NAME and self.font_correspondence_table.get(face):
                     font.attrs["face"] = self.font_correspondence_table[face]
+                else:
+                    font.attrs["face"] = self.DEFAULT_FONT_NAME
 
             if len(font.attrs) == 0:
                 font.unwrap()