diff --git a/database/migrations/2021_02_25_041236_create_dividends_table.php b/database/migrations/2021_02_25_041236_create_dividends_table.php
index 411a30a..3a50b05 100644
--- a/database/migrations/2021_02_25_041236_create_dividends_table.php
+++ b/database/migrations/2021_02_25_041236_create_dividends_table.php
@@ -2,7 +2,6 @@
 
 declare(strict_types=1);
 
-use App\Models\MarketData;
 use Illuminate\Database\Migrations\Migration;
 use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Support\Facades\Schema;
@@ -19,9 +18,11 @@ class CreateDividendsTable extends Migration
         Schema::create('dividends', function (Blueprint $table) {
             $table->uuid('id')->primary();
             $table->date('date');
-            $table->foreignIdFor(MarketData::class, 'symbol');
+            $table->string('symbol', 15);
             $table->float('dividend_amount', 12, 4);
             $table->timestamps();
+
+            $table->foreign('symbol')->references('symbol')->on('market_data');
         });
     }
 
diff --git a/database/migrations/2021_02_25_041246_create_splits_table.php b/database/migrations/2021_02_25_041246_create_splits_table.php
index 6ce2f4f..c4e9f9b 100644
--- a/database/migrations/2021_02_25_041246_create_splits_table.php
+++ b/database/migrations/2021_02_25_041246_create_splits_table.php
@@ -2,7 +2,6 @@
 
 declare(strict_types=1);
 
-use App\Models\MarketData;
 use Illuminate\Database\Migrations\Migration;
 use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Support\Facades\Schema;
@@ -19,9 +18,11 @@ class CreateSplitsTable extends Migration
         Schema::create('splits', function (Blueprint $table) {
             $table->uuid('id')->primary();
             $table->date('date');
-            $table->foreignIdFor(MarketData::class, 'symbol');
+            $table->string('symbol', 15);
             $table->float('split_amount', 12, 4);
             $table->timestamps();
+
+            $table->foreign('symbol')->references('symbol')->on('market_data');
         });
     }
 
diff --git a/database/migrations/2021_02_25_041257_create_transactions_table.php b/database/migrations/2021_02_25_041257_create_transactions_table.php
index f1f6fce..7ce5703 100644
--- a/database/migrations/2021_02_25_041257_create_transactions_table.php
+++ b/database/migrations/2021_02_25_041257_create_transactions_table.php
@@ -2,7 +2,6 @@
 
 declare(strict_types=1);
 
-use App\Models\MarketData;
 use App\Models\Portfolio;
 use Illuminate\Database\Migrations\Migration;
 use Illuminate\Database\Schema\Blueprint;
@@ -19,7 +18,7 @@ class CreateTransactionsTable extends Migration
     {
         Schema::create('transactions', function (Blueprint $table) {
             $table->uuid('id')->primary();
-            $table->foreignIdFor(MarketData::class, 'symbol');
+            $table->string('symbol', 15);
             $table->foreignIdFor(Portfolio::class, 'portfolio_id')->constrained()->onDelete('cascade');
             $table->string('transaction_type', 15);
             $table->float('quantity', 12, 4);
@@ -28,6 +27,8 @@ class CreateTransactionsTable extends Migration
             $table->boolean('split')->default(false);
             $table->date('date');
             $table->timestamps();
+
+            $table->foreign('symbol')->references('symbol')->on('market_data');
         });
     }