diff --git a/database/purchases.sql b/database/purchases.sql
index 280ea34..45741c4 100644
--- a/database/purchases.sql
+++ b/database/purchases.sql
@@ -14,7 +14,7 @@ CREATE TABLE IF NOT EXISTS `purchases` (
 	`bitcoin_price` DECIMAL(16, 4) NOT NULL,
 
 -- The amount of Bitcoin that can be purchased in relation to the amount of currency entered
-	`bitcoin_amount` DECIMAL(8, 8) NOT NULL DEFAULT 0.0000,
+	`bitcoin_amount` DECIMAL(16, 8) NOT NULL DEFAULT 0.0000,
 
 -- The Bitcoin network TXID that establishes the transaction has happened
 	`txid` VARCHAR(64) NULL DEFAULT NULL,
diff --git a/includes/Purchase.php b/includes/Purchase.php
index e2784b6..4162051 100644
--- a/includes/Purchase.php
+++ b/includes/Purchase.php
@@ -242,7 +242,7 @@ public function getCurrencyAmount() {
 	
 	private $bitcoinAmount;
 	
-	public function setBitcoinAmount(Amount $amt) {
+	private function setBitcoinAmount(Amount $amt) {
 		$this->bitcoinAmount = $amt;
 		return $this;
 	}
diff --git a/update.php b/update.php
index 33abf2f..7411dde 100644
--- a/update.php
+++ b/update.php
@@ -8,12 +8,17 @@
 
 $addEmailToNotify = true;
 $addNTXID = true;
+$fixPrecision = true;
 
 foreach ($stmt->fetchAll(PDO::FETCH_ASSOC) as $row) {
-	echo $row['Field'] . "\n";
 	if ($row['Field'] === 'email_to_notify') {
 		$addEmailToNotify = false;
 	}
+	if ($row['Field'] === 'bitcoin_amount') {
+		if (strpos($row['Type'], '16') !== false) {
+			$fixPrecision = false;
+		}
+	}
 	if ($row['Field'] === 'ntxid') {
 		$addNTXID = false;
 	}
@@ -37,6 +42,15 @@
 	echo "Column 'ntxid' added.\n";
 }
 
+if ($fixPrecision) {
+	$db->query('
+		ALTER TABLE `purchases`
+			MODIFY COLUMN
+				bitcoin_amount DECIMAL(16, 8) NOT NULL DEFAULT 0.0000
+	');
+	echo "Column 'bitcoin_amount' fixed.\n";
+}
+
 $stmt = $db->query(file_get_contents(__DIR__ . '/database/jobs.sql'));
 
 echo "update finished\n";