diff --git a/empire-db/src/test/java/org/apache/empire/commons/StringUtilsTest.java b/empire-db/src/test/java/org/apache/empire/commons/StringUtilsTest.java
index 3e14a98..664733e 100644
--- a/empire-db/src/test/java/org/apache/empire/commons/StringUtilsTest.java
+++ b/empire-db/src/test/java/org/apache/empire/commons/StringUtilsTest.java
@@ -63,7 +63,7 @@
 	@Test
 	public void testValueOfObject()
 	{
-		assertEquals("null",StringUtils.valueOf(null));
+		assertEquals("null",StringUtils.valueOf((Object)null));
 		assertEquals("",StringUtils.valueOf(""));
 		assertEquals("123",StringUtils.valueOf(Long.valueOf("123")));
 	}
@@ -71,7 +71,7 @@
 	@Test
 	public void testValueOfObjectArray()
 	{
-		assertEquals("null",StringUtils.valueOf(null));
+		assertEquals("null",StringUtils.valueOf((Object[])null));
 		assertEquals("null",StringUtils.valueOf(new Object[]{}));
 		assertEquals("123/12.3",StringUtils.valueOf(new Number[]{Integer.valueOf("123"), Double.valueOf("12.3")}));
 	}