diff --git a/javascript/TreeDropdownField.js b/javascript/TreeDropdownField.js
index 1b3dcbd0145..112d2a84014 100644
--- a/javascript/TreeDropdownField.js
+++ b/javascript/TreeDropdownField.js
@@ -137,7 +137,7 @@
 				else this.loadTree(null, updateFn);
 			},
 			setValue: function(val) {
-				this.find(':input:hidden').val(val);
+				this.find(':input:hidden').val(val).trigger('change');
 				this.updateTitle();
 				this.trigger('change');
 			},