diff --git a/java/google/registry/flows/StatelessRequestSessionMetadata.java b/java/google/registry/flows/StatelessRequestSessionMetadata.java
index 3fd3ebed6..39c393160 100644
--- a/java/google/registry/flows/StatelessRequestSessionMetadata.java
+++ b/java/google/registry/flows/StatelessRequestSessionMetadata.java
@@ -15,7 +15,7 @@
 package google.registry.flows;
 
 import static com.google.common.base.MoreObjects.toStringHelper;
-import static dagger.internal.Preconditions.checkNotNull;
+import static com.google.common.base.Preconditions.checkNotNull;
 import static google.registry.util.CollectionUtils.nullToEmpty;
 
 import com.google.common.base.Joiner;
diff --git a/javatests/google/registry/model/contact/ContactResourceTest.java b/javatests/google/registry/model/contact/ContactResourceTest.java
index b7e041cbc..67d61b085 100644
--- a/javatests/google/registry/model/contact/ContactResourceTest.java
+++ b/javatests/google/registry/model/contact/ContactResourceTest.java
@@ -20,6 +20,7 @@ import static google.registry.testing.ContactResourceSubject.assertAboutContacts
 import static google.registry.testing.DatastoreHelper.cloneAndSetAutoTimestamps;
 import static google.registry.testing.DatastoreHelper.createTld;
 import static google.registry.testing.DatastoreHelper.persistResource;
+import static google.registry.util.DateTimeUtils.END_OF_TIME;
 
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;
@@ -222,4 +223,10 @@ public class ContactResourceTest extends EntityTestCase {
     assertThat(afterTransfer.getCurrentSponsorClientId()).isEqualTo("winner");
     assertThat(afterTransfer.getLastTransferTime()).isEqualTo(clock.nowUtc().plusDays(1));
   }
+
+  @Test
+  public void testSetCreationTime_cantBeCalledTwice() {
+    thrown.expect(IllegalStateException.class, "creationTime can only be set once");
+    contactResource.asBuilder().setCreationTime(END_OF_TIME);
+  }
 }