diff --git a/includes/sql-schema/update.php b/includes/sql-schema/update.php
index 1d0c70804..154ac007c 100644
--- a/includes/sql-schema/update.php
+++ b/includes/sql-schema/update.php
@@ -169,3 +169,5 @@ if ($updating) {
 
     echo "-- Done\n";
 }
+
+dbReleaseLock('schema_update');