diff --git a/error-prone-contrib/src/test/java/tech/picnic/errorprone/refasterrules/RefasterRulesTest.java b/error-prone-contrib/src/test/java/tech/picnic/errorprone/refasterrules/RefasterRulesTest.java
index 6a67c37b7f..0fe39dec04 100644
--- a/error-prone-contrib/src/test/java/tech/picnic/errorprone/refasterrules/RefasterRulesTest.java
+++ b/error-prone-contrib/src/test/java/tech/picnic/errorprone/refasterrules/RefasterRulesTest.java
@@ -36,6 +36,7 @@ final class RefasterRulesTest {
           AssortedRules.class,
           BigDecimalRules.class,
           BugCheckerRules.class,
+          ClassRules.class,
           CollectionRules.class,
           ComparatorRules.class,
           DoubleStreamRules.class,
diff --git a/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/ClassRulesTestInput.java b/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/ClassRulesTestInput.java
index d59e3e18d2..2e94c24213 100644
--- a/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/ClassRulesTestInput.java
+++ b/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/ClassRulesTestInput.java
@@ -2,6 +2,7 @@
 
 import com.google.common.collect.ImmutableSet;
 import java.io.IOException;
+import java.util.function.Predicate;
 import tech.picnic.errorprone.refaster.test.RefasterRuleCollectionTestCase;
 
 final class ClassRulesTest implements RefasterRuleCollectionTestCase {
diff --git a/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/ClassRulesTestOutput.java b/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/ClassRulesTestOutput.java
index 548fa31439..39c08a5068 100644
--- a/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/ClassRulesTestOutput.java
+++ b/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/ClassRulesTestOutput.java
@@ -2,6 +2,7 @@
 
 import com.google.common.collect.ImmutableSet;
 import java.io.IOException;
+import java.util.function.Predicate;
 import tech.picnic.errorprone.refaster.test.RefasterRuleCollectionTestCase;
 
 final class ClassRulesTest implements RefasterRuleCollectionTestCase {