diff --git a/cosmoz-omnitable-group-row.html b/cosmoz-omnitable-group-row.html
index 509a1685..9e16102a 100644
--- a/cosmoz-omnitable-group-row.html
+++ b/cosmoz-omnitable-group-row.html
@@ -60,6 +60,11 @@
 				return 'group-row';
 			}
 
+			constructor() {
+				super();
+				this.trackColumns();
+			}
+
 			_columnChanged(newColumn) {
 				if (!newColumn) {
 					return;