diff --git a/gson/src/test/java/com/google/gson/functional/DefaultTypeAdaptersTest.java b/gson/src/test/java/com/google/gson/functional/DefaultTypeAdaptersTest.java
index 9773331c..0bb9e36c 100644
--- a/gson/src/test/java/com/google/gson/functional/DefaultTypeAdaptersTest.java
+++ b/gson/src/test/java/com/google/gson/functional/DefaultTypeAdaptersTest.java
@@ -264,7 +264,8 @@ public class DefaultTypeAdaptersTest extends TestCase {
     Properties props = new Properties();
     props.setProperty("foo", "bar");
     String json = gson.toJson(props);
-    System.out.println(json);
+    String expected = "{\"foo\":\"bar\"}";
+    assertEquals(expected, json);
   }
   
   public void testPropertiesDeserialization() {