diff --git a/include/class.forms.php b/include/class.forms.php
index 465bb79d14f49f15341bb9bd0399086bfff61ca2..74bb0a64dfcb040dbd5b02fd83a7a8e8de883ccc 100644
--- a/include/class.forms.php
+++ b/include/class.forms.php
@@ -2086,6 +2086,10 @@ class PriorityField extends ChoiceField {
         return ($value instanceof Priority) ? $value->getDesc() : $value;
     }
 
+    function whatChanged($before, $after) {
+        return FormField::whatChanged($before, $after);
+    }
+
     function searchable($value) {
         // Priority isn't searchable this way
         return null;