diff --git a/lib/pdd/source.rb b/lib/pdd/source.rb
index eacca87..b15574f 100644
--- a/lib/pdd/source.rb
+++ b/lib/pdd/source.rb
@@ -75,7 +75,7 @@ def puzzle(lines, match, idx)
       rescue Error => ex
         raise Error, "#{ex.message} in line ##{idx}"
       end
-      body = (match[3] + ' ' + tail.join(' ')).gsub(/\s+/, ' ').strip
+      body = (match[3] + ' ' + tail.join(' ')).gsub(/[\s\n\t]+/, ' ').strip
       Puzzle.new(
         marker(match[2]).merge(
           lines: "#{idx + 1}-#{idx + tail.size + 1}",