diff --git a/lib/proportions.js b/lib/proportions.js
index 84d8cd9..83cdb21 100644
--- a/lib/proportions.js
+++ b/lib/proportions.js
@@ -167,7 +167,7 @@ define(['d3-interpolate', 'snabbdom', 'filters/genericnode', 'helper'],
         h2.classList.add('proportion-header');
         h2.textContent = _.t(heading);
         h2.onclick = function onclick() {
-          table.classList.toggle('hide');
+          table.elm.classList.toggle('hide');
         };
         el.appendChild(h2);
         el.appendChild(table.elm);