diff --git a/update.php b/update.php
index 6089074042a6456ff2b1fa863ab97b463e025c02..86e5e09a2c4905154904a82215cc17eec761b420 100644
--- a/update.php
+++ b/update.php
@@ -494,6 +494,7 @@ function update_31() {
 function update_32() {
   update_sql("ALTER TABLE users ADD index (sid(4))");
   update_sql("ALTER TABLE users ADD index (timestamp)");
+  update_sql("ALTER TABLE users ADD UNIQUE KEY name (name)");
 }
 
 function update_33() {