diff --git a/providers/google-compute-engine/src/main/java/org/jclouds/googlecomputeengine/domain/Warning.java b/providers/google-compute-engine/src/main/java/org/jclouds/googlecomputeengine/domain/Warning.java
index ec2f4b9d2c4..a28a159a7b5 100644
--- a/providers/google-compute-engine/src/main/java/org/jclouds/googlecomputeengine/domain/Warning.java
+++ b/providers/google-compute-engine/src/main/java/org/jclouds/googlecomputeengine/domain/Warning.java
@@ -26,9 +26,9 @@
 @AutoValue
 public abstract class Warning {
 
-   public abstract String code();
+   @Nullable public abstract String code();
    @Nullable public abstract String message();
-   public abstract List<KeyValuePair> data();
+   @Nullable public abstract List<KeyValuePair> data();
 
    @SerializedNames({"code", "message", "data"})
    public static Warning create(String code, String message, List<KeyValuePair> data){