diff --git a/core/lib/Drupal/Core/Database/Connection.php b/core/lib/Drupal/Core/Database/Connection.php
index af91674..9aeb8d9 100644
--- a/core/lib/Drupal/Core/Database/Connection.php
+++ b/core/lib/Drupal/Core/Database/Connection.php
@@ -829,7 +829,7 @@ public function schema() {
    *   The sanitized database name string.
    */
   public function escapeDatabase($database) {
-    return preg_replace('/[^A-Za-z0-9_.]+/', '', $database);
+    return preg_replace('/[^A-Za-z0-9_]+/', '', $database);
   }
 
   /**