diff --git a/java/com/google/gerrit/plugins/codeowners/testing/CodeOwnerConfigSubject.java b/java/com/google/gerrit/plugins/codeowners/testing/CodeOwnerConfigSubject.java
index bc2e0cd..706345e 100644
--- a/java/com/google/gerrit/plugins/codeowners/testing/CodeOwnerConfigSubject.java
+++ b/java/com/google/gerrit/plugins/codeowners/testing/CodeOwnerConfigSubject.java
@@ -19,7 +19,6 @@
 import static com.google.gerrit.plugins.codeowners.testing.CodeOwnerSetSubject.codeOwnerSets;
 import static com.google.gerrit.truth.ListSubject.elements;
 
-import com.google.common.collect.ImmutableList;
 import com.google.common.truth.BooleanSubject;
 import com.google.common.truth.FailureMetadata;
 import com.google.common.truth.Subject;
@@ -89,7 +88,7 @@
   public ListSubject<CodeOwnerConfigReferenceSubject, CodeOwnerConfigReference> hasImportsThat() {
     return check("imports()")
         .about(elements())
-        .thatCustom(ImmutableList.copyOf(codeOwnerConfig().imports()), codeOwnerConfigReferences());
+        .thatCustom(codeOwnerConfig().imports().asList(), codeOwnerConfigReferences());
   }
 
   /**