diff --git a/database/migrations/2017_01_25_063357_fix_utf8_custom_field_column_names.php b/database/migrations/2017_01_25_063357_fix_utf8_custom_field_column_names.php
index 5e8379bdad..7f84bc2eb9 100644
--- a/database/migrations/2017_01_25_063357_fix_utf8_custom_field_column_names.php
+++ b/database/migrations/2017_01_25_063357_fix_utf8_custom_field_column_names.php
@@ -52,10 +52,12 @@ class FixUtf8CustomFieldColumnNames extends Migration
         $platform = Schema::getConnection()->getDoctrineSchemaManager()->getDatabasePlatform();
         $platform->registerDoctrineTypeMapping('enum', 'string');
 
-        Schema::table('custom_fields', function ($table) {
-            $table->string('db_column')->nullable();
-            $table->text('help_text')->nullable();
-        });
+        if (!Schema::hasColumn('custom_fields', 'db_column')) {
+            Schema::table('custom_fields', function ($table) {
+                $table->string('db_column')->nullable();
+                $table->text('help_text')->nullable();
+            });
+        }
 
         foreach(CustomField::all() as $field) {