diff --git a/scripts/util/purge_cache.php b/scripts/util/purge_cache.php
index 5c8da7b0bb..4e225595ee 100755
--- a/scripts/util/purge_cache.php
+++ b/scripts/util/purge_cache.php
@@ -88,6 +88,12 @@ if ($purge_changesets) {
 if ($purge_differential) {
   echo "Purging Differential comment cache...\n";
   $table = new DifferentialComment();
+  queryfx(
+    $table->establishConnection('w'),
+    'UPDATE %T SET cache = NULL',
+    $table->getTableName());
+  echo "Purging Differential inline comment cache...\n";
+  $table = new DifferentialInlineComment();
   queryfx(
     $table->establishConnection('w'),
     'UPDATE %T SET cache = NULL',