diff --git a/src/storage/connection/isolated/AphrontIsolatedDatabaseConnection.php b/src/storage/connection/isolated/AphrontIsolatedDatabaseConnection.php
index 11b0f8372f..25f57e4cc9 100644
--- a/src/storage/connection/isolated/AphrontIsolatedDatabaseConnection.php
+++ b/src/storage/connection/isolated/AphrontIsolatedDatabaseConnection.php
@@ -70,7 +70,7 @@ final class AphrontIsolatedDatabaseConnection
     return $this->affectedRows;
   }
 
-  public function getTransactionKey() {
+  protected function getTransactionKey() {
     return $this->transactionKey;
   }
 
diff --git a/src/storage/connection/mysql/AphrontMySQLDatabaseConnection.php b/src/storage/connection/mysql/AphrontMySQLDatabaseConnection.php
index 01d223b4a1..a1fffbb944 100644
--- a/src/storage/connection/mysql/AphrontMySQLDatabaseConnection.php
+++ b/src/storage/connection/mysql/AphrontMySQLDatabaseConnection.php
@@ -192,7 +192,7 @@ final class AphrontMySQLDatabaseConnection extends AphrontDatabaseConnection {
     return mysql_affected_rows($this->requireConnection());
   }
 
-  public function getTransactionKey() {
+  protected function getTransactionKey() {
     return (int)$this->requireConnection();
   }