diff --git a/database/migrations/2021_01_10_164334_create_mining_tax_tables.php b/database/migrations/2021_01_10_164334_create_mining_tax_tables.php
index fb603b6f5..29c82a624 100644
--- a/database/migrations/2021_01_10_164334_create_mining_tax_tables.php
+++ b/database/migrations/2021_01_10_164334_create_mining_tax_tables.php
@@ -18,7 +18,7 @@ class CreateMiningTaxTables extends Migration
                 $table->id();
                 $table->unsignedBigInteger('character_id');
                 $table->string('character_name');
-                $table->unsignedBigInteger('invoice_id')->nullable();
+                $table->string('invoice_id')->nullable();
                 $table->float('invoice_amount')->default(0.00);
                 $table->dateTime('date_issued');
                 $table->dateTime('date_due');