diff --git a/database/migrations/2016_07_22_054850_one_more_mac_addr_fix.php b/database/migrations/2016_07_22_054850_one_more_mac_addr_fix.php
new file mode 100644
index 0000000000..cc45976d54
--- /dev/null
+++ b/database/migrations/2016_07_22_054850_one_more_mac_addr_fix.php
@@ -0,0 +1,34 @@
+<?php
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class OneMoreMacAddrFix extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        foreach(\App\Models\CustomField::all() as $custom_field) {
+
+            if ($custom_field->format=='regex:/^MAC$/') {
+                $custom_field->format = 'regex:/^[a-fA-F0-9]{2}:[a-fA-F0-9]{2}:[a-fA-F0-9]{2}:[a-fA-F0-9]{2}:[a-fA-F0-9]{2}:[a-fA-F0-9]{2}$/';
+            }
+            $custom_field->save();
+
+        }
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        //
+    }
+}