diff --git a/database/factories/SubBookingFactory.php b/database/factories/SubBookingFactory.php
index 8d78288..624c492 100644
--- a/database/factories/SubBookingFactory.php
+++ b/database/factories/SubBookingFactory.php
@@ -19,27 +19,27 @@ $factory->define(App\SubBooking::class, function (Faker $faker) {
        // Overpaid
        if ($randomPersonTarget->ioType->name === 'Einnahme') {
            $randomAccountType = AccountType::incomes()->random();
-           $amount = $randomPersonTarget->difference() + rand(1, 100);
+           $amount = abs($randomPersonTarget->difference() + rand(1, 100));
        } else {
            $randomAccountType = AccountType::expeditures()->random();
-           $amount = $randomPersonTarget->difference() + rand(1, 100);
+           $amount = abs($randomPersonTarget->difference() + rand(1, 100));
        }
     } else if (rand_bool(20)) {
        // Underpaid
        if ($randomPersonTarget->ioType->name === 'Einnahme') {
            $randomAccountType = AccountType::incomes()->random();
-           $amount = $randomPersonTarget->difference() - rand(1, $randomPersonTarget->difference());
+           $amount = abs($randomPersonTarget->difference() - rand(1, $randomPersonTarget->difference()));
        } else {
            $randomAccountType = AccountType::expeditures()->random();
-           $amount = $randomPersonTarget->difference() - rand(1, $randomPersonTarget->difference());
+           $amount = abs($randomPersonTarget->difference() - rand(1, $randomPersonTarget->difference()));
        }
     } else {
        if ($randomPersonTarget->ioType->name === 'Einnahme') {
            $randomAccountType = AccountType::incomes()->random();
-           $amount = $randomPersonTarget->difference();
+           $amount = abs($randomPersonTarget->difference());
        } else {
            $randomAccountType = AccountType::expeditures()->random();
-           $amount = $randomPersonTarget->difference();
+           $amount = abs($randomPersonTarget->difference());
        }
     }