diff --git a/lib/annotate/annotate_models.rb b/lib/annotate/annotate_models.rb
index dc2901a3..e2e13813 100644
--- a/lib/annotate/annotate_models.rb
+++ b/lib/annotate/annotate_models.rb
@@ -834,7 +834,7 @@ def max_schema_info_width(klass, options)
         end.max || 0
         max_size += 2
       else
-        max_size = cols.map(&:name).map(&:size).max
+        max_size = cols.map(&:name).map(&:size).max || 0
       end
       max_size += options[:format_rdoc] ? 5 : 1