diff --git a/wp-admin/includes/upgrade.php b/wp-admin/includes/upgrade.php
index f514199fc5..c38ea8355f 100644
--- a/wp-admin/includes/upgrade.php
+++ b/wp-admin/includes/upgrade.php
@@ -1712,17 +1712,6 @@ function maybe_disable_automattic_widgets() {
 function pre_schema_upgrade() {
 	global $wp_current_db_version, $wp_db_version, $wpdb;
 
-	// Upgrade 2.9 development versions
-	if ( ( $wp_current_db_version >= 11557 ) && ( $wp_current_db_version < 12217 ) ) {
-		// Drop the option_id index. dbDelta() doesn't do the drop.
-		$wpdb->query("ALTER TABLE $wpdb->options DROP INDEX option_id");
-
-		// Drop the old primary key and add the new.
-		$wpdb->query("ALTER TABLE $wpdb->options DROP PRIMARY KEY, ADD PRIMARY KEY(option_id)");
-
-		return;
-	}
-
 	// Upgrade versions prior to 2.9
 	if ( $wp_current_db_version < 11557 ) {
 		// Delete duplicate options.  Keep the option with the highest option_id.