diff --git a/src/libprs500/ebooks/lrf/html/convert_from.py b/src/libprs500/ebooks/lrf/html/convert_from.py
index 8b70a45182..43c2f39387 100644
--- a/src/libprs500/ebooks/lrf/html/convert_from.py
+++ b/src/libprs500/ebooks/lrf/html/convert_from.py
@@ -1012,7 +1012,7 @@ class HTMLConverter(object):
         if not self.page_break_found and self.page_break.match(tagname):
             number_of_paragraphs = sum([
                 len([1 for i in block.contents if isinstance(i, Paragraph)])
-                for block in self.current_page.contents is isinstance(block, TextBlock) 
+                for block in self.current_page.contents if isinstance(block, TextBlock) 
             ])
             
             if number_of_paragraphs > 2: