diff --git a/src/applications/differential/parser/DifferentialChangesetParser.php b/src/applications/differential/parser/DifferentialChangesetParser.php
index 646e1b65b1..35f6cef856 100644
--- a/src/applications/differential/parser/DifferentialChangesetParser.php
+++ b/src/applications/differential/parser/DifferentialChangesetParser.php
@@ -61,6 +61,7 @@ final class DifferentialChangesetParser {
   private $highlightErrors;
 
   const CACHE_VERSION = 6;
+  const CACHE_MAX_SIZE = 8e6;
 
   const ATTR_GENERATED  = 'attr:generated';
   const ATTR_DELETED    = 'attr:deleted';
@@ -746,6 +747,11 @@ final class DifferentialChangesetParser {
     }
     $cache = json_encode($cache);
 
+    // We don't want to waste too much space by a single changeset.
+    if (strlen($cache) > self::CACHE_MAX_SIZE) {
+      return;
+    }
+
     try {
       $changeset = new DifferentialChangeset();
       $conn_w = $changeset->establishConnection('w');