diff --git a/pitest-entry/src/main/java/org/pitest/mutationtest/build/DefaultTestPrioritiser.java b/pitest-entry/src/main/java/org/pitest/mutationtest/build/DefaultTestPrioritiser.java
index ddb501c2a..cd5c90281 100644
--- a/pitest-entry/src/main/java/org/pitest/mutationtest/build/DefaultTestPrioritiser.java
+++ b/pitest-entry/src/main/java/org/pitest/mutationtest/build/DefaultTestPrioritiser.java
@@ -22,7 +22,7 @@
  */
 public class DefaultTestPrioritiser implements TestPrioritiser {
 
-  private static final int       TIME_WEIGHTING_FOR_DIRECT_UNIT_TESTS = 1000;
+  private static final int TIME_WEIGHTING_FOR_DIRECT_UNIT_TESTS = 1000;
 
   private final CoverageDatabase coverage;
 
diff --git a/pitest/src/main/java/org/pitest/mutationtest/engine/gregor/GregorMutater.java b/pitest/src/main/java/org/pitest/mutationtest/engine/gregor/GregorMutater.java
index 70456029d..1df8c795c 100644
--- a/pitest/src/main/java/org/pitest/mutationtest/engine/gregor/GregorMutater.java
+++ b/pitest/src/main/java/org/pitest/mutationtest/engine/gregor/GregorMutater.java
@@ -102,7 +102,7 @@ public Mutant getMutation(final MutationIdentifier id) {
         this.computeCache, FrameOptions.pickFlags(bytes.get()));
     final MutatingClassVisitor mca = new MutatingClassVisitor(w, context,
         filterMethods(), FCollection.filter(this.mutators,
-            isMutatorFor(id)));
+            m -> m.isMutatorFor(id)));
     reader.accept(mca, ClassReader.EXPAND_FRAMES);
 
     final List<MutationDetails> details = context.getMutationDetails(context
@@ -112,11 +112,6 @@ public Mutant getMutation(final MutationIdentifier id) {
 
   }
 
-  private static Predicate<MethodMutatorFactory> isMutatorFor(
-      final MutationIdentifier id) {
-    return a -> id.getMutator().equals(a.getGloballyUniqueId());
-  }
-
   private Predicate<MethodInfo> filterMethods() {
     return and(this.filter, filterSyntheticMethods());
   }
diff --git a/pitest/src/main/java/org/pitest/mutationtest/engine/gregor/MethodMutatorFactory.java b/pitest/src/main/java/org/pitest/mutationtest/engine/gregor/MethodMutatorFactory.java
index 550b39822..970d8c223 100644
--- a/pitest/src/main/java/org/pitest/mutationtest/engine/gregor/MethodMutatorFactory.java
+++ b/pitest/src/main/java/org/pitest/mutationtest/engine/gregor/MethodMutatorFactory.java
@@ -15,6 +15,7 @@
 package org.pitest.mutationtest.engine.gregor;
 
 import org.objectweb.asm.MethodVisitor;
+import org.pitest.mutationtest.engine.MutationIdentifier;
 import org.pitest.plugin.ClientClasspathPlugin;
 
 /**
@@ -61,4 +62,8 @@ default String description() {
     return getName();
   }
 
+  default boolean isMutatorFor(MutationIdentifier id) {
+    return id.getMutator().equals(getGloballyUniqueId());
+  }
+
 }