diff --git a/PubSub/src/BatchPublisher.php b/PubSub/src/BatchPublisher.php
index 6177138f8388..bfdaa6388cc5 100644
--- a/PubSub/src/BatchPublisher.php
+++ b/PubSub/src/BatchPublisher.php
@@ -65,9 +65,15 @@ class BatchPublisher
      */
     private $client;
 
-    private bool $enableCompression;
+    /**
+     * @var bool
+     */
+    private $enableCompression;
 
-    private int $compressionBytesThreshold;
+    /**
+     * @var int
+     */
+    private $compressionBytesThreshold;
 
     /**
      * @param string $topicName The topic name.
diff --git a/PubSub/src/Topic.php b/PubSub/src/Topic.php
index 663524376dfd..7815e46700a0 100644
--- a/PubSub/src/Topic.php
+++ b/PubSub/src/Topic.php
@@ -89,10 +89,15 @@ class Topic
      */
     private $clientConfig;
 
-    private bool $enableCompression;
-
+    /**
+     * @var bool
+     */
+    private $enableCompression;
 
-    private int $compressionBytesThreshold;
+    /**
+     * @var int
+     */
+    private $compressionBytesThreshold;
 
     /**
      * Create a PubSub topic.