1 files changed, 1 insertions, 1 deletions
diff --git a/testutil/src/main/java/com/yahoo/test/TotalOrderTester.java b/testutil/src/main/java/com/yahoo/test/TotalOrderTester.java
index 850369fbc2e..e95bc056ba8 100644
--- a/testutil/src/main/java/com/yahoo/test/TotalOrderTester.java
+++ b/testutil/src/main/java/com/yahoo/test/TotalOrderTester.java
@@ -20,7 +20,7 @@ import static org.junit.Assert.assertTrue;
  * @author Vegard Sjonfjell
  */
 
-public class TotalOrderTester<T extends Comparable<T>> extends OrderTester<T> {
+public class TotalOrderTester<T extends Comparable<? super T>> extends OrderTester<T> {
     protected void lessTest(T a, T b) throws AssertionError {
         assertTrue(a + " must be less than " + b, a.compareTo(b) <= -1);
     }