diff --git a/Bigtable/metadata/V2/Session.php b/Bigtable/metadata/V2/Session.php
index aac2cf897f7..efe1126b828 100644
--- a/Bigtable/metadata/V2/Session.php
+++ b/Bigtable/metadata/V2/Session.php
@@ -24,7 +24,7 @@ public static function initOnce() {
         \GPBMetadata\Google\Rpc\ErrorDetails::initOnce();
         \GPBMetadata\Google\Rpc\Status::initOnce();
         $pool->internalAddGeneratedFile(
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         , true);
 
         static::$is_initialized = true;
diff --git a/Bigtable/src/V2/SessionType.php b/Bigtable/src/V2/SessionType.php
index 05fad065098..d8b1bf18112 100644
--- a/Bigtable/src/V2/SessionType.php
+++ b/Bigtable/src/V2/SessionType.php
@@ -32,9 +32,9 @@ class SessionType
     /**
      * For internal protocol testing only.
      *
-     * Generated from protobuf enum <code>SESSION_TYPE_TEST = -1;</code>
+     * Generated from protobuf enum <code>SESSION_TYPE_TEST = 9999;</code>
      */
-    const SESSION_TYPE_TEST = -1;
+    const SESSION_TYPE_TEST = 9999;
 
     private static $valueToName = [
         self::SESSION_TYPE_UNSET => 'SESSION_TYPE_UNSET',