diff --git a/Source/Source.php b/Source/Source.php
index 4b21b2d..cc2064d 100644
--- a/Source/Source.php
+++ b/Source/Source.php
@@ -208,7 +208,7 @@
 				username	C(64)	NOTNULL DEFAULT \" '' \"
 				",
 				array( 'mysql' => 'DEFAULT CHARSET=utf8' ) ) ),
-			array( 'CreateIndexSQL', array( 'idx_user_username', plugin_table( 'user' ), 'username', array( 'UNIQUE' ) ) ),
+			array( 'CreateIndexSQL', array( 'idx_source_user_username', plugin_table( 'user' ), 'username', array( 'UNIQUE' ) ) ),
 			# 2010-02-11 - Update repo types from svn->websvn
 			array( 'UpdateSQL', array( plugin_table( 'repository' ), ' SET type="websvn" WHERE type="svn"' ) ),
 		);