diff --git a/src/applications/transactions/editfield/PhabricatorStringListEditField.php b/src/applications/transactions/editfield/PhabricatorStringListEditField.php
--- a/src/applications/transactions/editfield/PhabricatorStringListEditField.php
+++ b/src/applications/transactions/editfield/PhabricatorStringListEditField.php
@@ -7,6 +7,11 @@
     return new AphrontFormTextControl();
   }
 
+  protected function getValueForControl() {
+    $value = $this->getValue();
+    return implode(', ', $value);
+  }
+
   protected function newConduitParameterType() {
     return new ConduitStringListParameterType();
   }