diff --git a/lib/db/install.xml b/lib/db/install.xml
index 518e8518e14..0ecd779be35 100644
--- a/lib/db/install.xml
+++ b/lib/db/install.xml
@@ -2959,7 +2959,6 @@
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
         <KEY NAME="pushid-userid" TYPE="unique" FIELDS="pushid, userid"/>
-        <KEY NAME="pushid-platform" TYPE="unique" FIELDS="pushid, platform"/>
         <KEY NAME="userid" TYPE="foreign" FIELDS="userid" REFTABLE="user" REFFIELDS="id"/>
       </KEYS>
     </TABLE>
diff --git a/lib/db/upgrade.php b/lib/db/upgrade.php
index ad1e596e5df..f1e5d2382fe 100644
--- a/lib/db/upgrade.php
+++ b/lib/db/upgrade.php
@@ -3669,5 +3669,15 @@ function xmldb_main_upgrade($oldversion) {
         upgrade_main_savepoint(true, 2014051200.06);
     }
 
+    if ($oldversion < 2014051201.03) {
+        $table = new xmldb_table('user_devices');
+        $oldindex = new xmldb_index('pushid-platform', XMLDB_KEY_UNIQUE, array('pushid', 'platform'));
+        if ($dbman->index_exists($table, $oldindex)) {
+            $key = new xmldb_key('pushid-platform', XMLDB_KEY_UNIQUE, array('pushid', 'platform'));
+            $dbman->drop_key($table, $key);
+        }
+        upgrade_main_savepoint(true, 2014051201.03);
+    }
+
     return true;
 }
diff --git a/user/externallib.php b/user/externallib.php
index 24daf4f60bb..7b298e81877 100644
--- a/user/externallib.php
+++ b/user/externallib.php
@@ -1119,16 +1119,6 @@ class core_user_external extends external_api {
             return $warnings;
         }
 
-        // The same key can't exists for the same platform.
-        if ($DB->get_record('user_devices', array('pushid' => $params['pushid'], 'platform' => $params['platform']))) {
-            $warnings['warning'][] = array(
-                'item' => $params['pushid'],
-                'warningcode' => 'existingkeyforplatform',
-                'message' => 'This key is already stored for other device using the same platform'
-            );
-            return $warnings;
-        }
-
         $userdevice = new stdclass;
         $userdevice->userid     = $USER->id;
         $userdevice->appid      = $params['appid'];
diff --git a/version.php b/version.php
index fdcd7383f21..4b8791d78eb 100644
--- a/version.php
+++ b/version.php
@@ -29,7 +29,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$version  = 2014051201.02;              // 20140512      = branching date YYYYMMDD - do not modify!
+$version  = 2014051201.03;              // 20140512      = branching date YYYYMMDD - do not modify!
                                         //         RR    = release increments - 00 in DEV branches.
                                         //           .XX = incremental changes.