diff --git a/src/calibre/utils/fonts/sfnt/subset.py b/src/calibre/utils/fonts/sfnt/subset.py
index 9e20127614..bb8b73d013 100644
--- a/src/calibre/utils/fonts/sfnt/subset.py
+++ b/src/calibre/utils/fonts/sfnt/subset.py
@@ -84,7 +84,7 @@ def do_warn(warnings, *args):
 def pdf_subset(sfnt, glyphs):
     for tag in tuple(sfnt.tables):
         if tag not in {b'hhea', b'head', b'hmtx', b'maxp',
-                       b'OS/2', b'post', b'cvt', b'fpgm', b'glyf', b'loca',
+                       b'OS/2', b'post', b'cvt ', b'fpgm', b'glyf', b'loca',
                        b'prep', b'CFF ', b'VORG'}:
             # Remove non core tables since they are unused in PDF rendering
             del sfnt[tag]