diff --git a/wp-admin/includes/upgrade.php b/wp-admin/includes/upgrade.php
index ad5871e13d..0955794851 100644
--- a/wp-admin/includes/upgrade.php
+++ b/wp-admin/includes/upgrade.php
@@ -205,6 +205,9 @@ function upgrade_all() {
 	if ( $wp_current_db_version < 7796 )
 		upgrade_251();
 
+	if ( $wp_current_db_version < 7935 )
+		upgrade_252();
+
 	maybe_disable_automattic_widgets();
 
 	$wp_rewrite->flush_rules();
@@ -733,6 +736,12 @@ function upgrade_251() {
 	update_option('secret', wp_generate_password(64));
 }
 
+function upgrade_252() {
+	global $wpdb;
+
+	$wpdb->query("UPDATE $wpdb->users SET user_activation_key = ''");
+}
+
 // The functions we use to actually do stuff
 
 // General
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 3f0bb037c2..09e0b6b083 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,6 +16,6 @@ $wp_version = '2.6-bleeding';
  *
  * @global int $wp_db_version
  */
-$wp_db_version = 7842;
+$wp_db_version = 7935;
 
 ?>