diff --git a/src/main/java/org/qortal/utils/Amounts.java b/src/main/java/org/qortal/utils/Amounts.java
index b53f1977..a975e322 100644
--- a/src/main/java/org/qortal/utils/Amounts.java
+++ b/src/main/java/org/qortal/utils/Amounts.java
@@ -12,21 +12,7 @@ public abstract class Amounts {
 	public static final BigInteger ROUNDING = MULTIPLIER_BI.subtract(BigInteger.ONE);
 
 	public static String prettyAmount(long amount) {
-		StringBuilder stringBuilder = new StringBuilder(20);
-
-		stringBuilder.append(amount / MULTIPLIER);
-
-		stringBuilder.append('.');
-
-		int dpLength = stringBuilder.length();
-
-		stringBuilder.append(Math.abs(amount % MULTIPLIER));
-
-		int paddingRequired = 8 - (stringBuilder.length() - dpLength);
-		if (paddingRequired > 0)
-			stringBuilder.append("00000000", 0, paddingRequired);
-
-		return stringBuilder.toString();
+		return String.format("%d.%08d", amount / MULTIPLIER, amount % MULTIPLIER);
 	}
 
 	public static BigDecimal toBigDecimal(long amount) {
diff --git a/src/test/java/org/qortal/test/AmountsTests.java b/src/test/java/org/qortal/test/AmountsTests.java
new file mode 100644
index 00000000..90159466
--- /dev/null
+++ b/src/test/java/org/qortal/test/AmountsTests.java
@@ -0,0 +1,22 @@
+package org.qortal.test;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+import org.qortal.utils.Amounts;
+
+public class AmountsTests {
+
+	@Test
+	public void testPrettyAmount() {
+		testPrettyAmount(1L, "0.00000001");
+		testPrettyAmount(100000L, "0.00100000");
+		testPrettyAmount(100000000L, "1.00000000");
+		testPrettyAmount(1000000000L, "10.00000000");
+	}
+
+	private void testPrettyAmount(long amount, String prettyAmount) {
+		assertEquals(prettyAmount, Amounts.prettyAmount(amount));
+	}
+
+}