diff --git a/com.google.eclipse.protobuf.test/src/com/google/eclipse/protobuf/conversion/HEXValueConverter_toValue_Test.java b/com.google.eclipse.protobuf.test/src/com/google/eclipse/protobuf/conversion/HEXValueConverter_toValue_Test.java
index ba29fdc..cd1f5fe 100644
--- a/com.google.eclipse.protobuf.test/src/com/google/eclipse/protobuf/conversion/HEXValueConverter_toValue_Test.java
+++ b/com.google.eclipse.protobuf.test/src/com/google/eclipse/protobuf/conversion/HEXValueConverter_toValue_Test.java
@@ -42,7 +42,7 @@
       { "0x1", 1L },
       { "0xA", 10L },
       { "0xFF", 255L },
-      { "0xffffffffffffffff", -1L }
+      { "0xffffffffffffffff", -1L } // overflow
     });
   }