diff --git a/core/model/DataDifferencer.php b/core/model/DataDifferencer.php
index d0dcf5857..63b4a0fab 100644
--- a/core/model/DataDifferencer.php
+++ b/core/model/DataDifferencer.php
@@ -111,9 +111,11 @@ class DataDifferencer extends ViewableData {
 				$changedFields->push(new ArrayData(array(
 					'Name' => $field,
 					'Title' => $base->fieldLabel($field),
-					'Diff' => $this->fromRecord
-						? Diff::compareHTML($this->fromRecord->$field, $this->toRecord->$field)
-						: "<ins>" . $this->toRecord->$field . "</ins>",
+					'Diff' => new SS_HTMLValue( 
+						$this->fromRecord
+							? Diff::compareHTML($this->fromRecord->$field, $this->toRecord->$field)
+							: "<ins>" . $this->toRecord->$field . "</ins>"
+						),
 					'From' => $this->fromRecord ? $this->fromRecord->$field : null,
 					'To' => $this->toRecord ? $this->toRecord->$field : null,
 				)));