diff --git a/System/Libraries/Html/Renderer.HC b/System/Libraries/Html/Renderer.HC
index 3d546dd..a96da1b 100644
--- a/System/Libraries/Html/Renderer.HC
+++ b/System/Libraries/Html/Renderer.HC
@@ -81,6 +81,7 @@ class @html_renderer
     HttpUrl* current_url;
     JsonArray* css_rules;
     JsonArray* forms;
+    U8* form_data_str;
     U8* cache_directory;
     U8* current_title;
     U8* current_url_string;