diff --git a/modules/backend/database/migrations/2014_01_04_000005_Db_Backend_User_Preferences.php b/modules/backend/database/migrations/2014_01_04_000005_Db_Backend_User_Preferences.php
index 21bbd4fdf..397bead9b 100644
--- a/modules/backend/database/migrations/2014_01_04_000005_Db_Backend_User_Preferences.php
+++ b/modules/backend/database/migrations/2014_01_04_000005_Db_Backend_User_Preferences.php
@@ -16,7 +16,7 @@ class DbBackendUserPreferences extends Migration
             $table->string('group');
             $table->string('item');
             $table->text('value')->nullable();
-            $table->index(['user_id', 'namespace', 'group', 'item']);
+            $table->index(['user_id', 'namespace', 'group', 'item'], 'key_index');
         });
     }
 
diff --git a/modules/system/database/migrations/2013_10_01_000006_Db_System_Parameters.php b/modules/system/database/migrations/2013_10_01_000006_Db_System_Parameters.php
index 12b9784f4..48e9a6e49 100644
--- a/modules/system/database/migrations/2013_10_01_000006_Db_System_Parameters.php
+++ b/modules/system/database/migrations/2013_10_01_000006_Db_System_Parameters.php
@@ -15,7 +15,7 @@ class DbSystemParameters extends Migration
             $table->string('group');
             $table->string('item');
             $table->text('value')->nullable();
-            $table->index(['namespace', 'group', 'item']);
+            $table->index(['namespace', 'group', 'item'], 'key_index');
         });
     }