diff --git a/database/migrations/2017_12_09_000000_add_currency_columns.php b/database/migrations/2017_12_09_000000_add_currency_columns.php
index 0da22dcef..1d6aeef23 100644
--- a/database/migrations/2017_12_09_000000_add_currency_columns.php
+++ b/database/migrations/2017_12_09_000000_add_currency_columns.php
@@ -28,11 +28,13 @@ class AddCurrencyColumns extends Migration
     public function down()
     {
         Schema::table('currencies', function ($table) {
-            $table->dropColumn('precision');
-            $table->dropColumn('symbol');
-            $table->dropColumn('symbol_first');
-            $table->dropColumn('decimal_mark');
-            $table->dropColumn('thousands_separator');
+            $table->dropColumn([
+                'precision',
+                'symbol',
+                'symbol_first',
+                'decimal_mark',
+                'thousands_separator',
+            ]);
         });
     }
 }
diff --git a/database/migrations/2018_04_23_000000_add_category_column_invoices_bills.php b/database/migrations/2018_04_23_000000_add_category_column_invoices_bills.php
index d32668d85..24c9eb6c2 100644
--- a/database/migrations/2018_04_23_000000_add_category_column_invoices_bills.php
+++ b/database/migrations/2018_04_23_000000_add_category_column_invoices_bills.php
@@ -12,11 +12,11 @@ class AddCategoryColumnInvoicesBills extends Migration
     public function up()
     {
         Schema::table('invoices', function ($table) {
-            $table->integer('category_id');
+            $table->integer('category_id')->default();
         });
 
         Schema::table('bills', function ($table) {
-            $table->integer('category_id');
+            $table->integer('category_id')->default();
         });
     }