diff --git a/config.rb b/config.rb
index 33b0dd7..f49d4b0 100644
--- a/config.rb
+++ b/config.rb
@@ -63,7 +63,8 @@ def load_svg(file)
               ignore_urls: [/rubydoc|gazebosim/],
               url_ignore: [/rubydoc|gazebosim/] }
         ).run
-    rescue RuntimeError => e
+    rescue SystemExit => e
+        # HTMLProofer calls exit on failure (!)
         puts e
     end
 end