diff --git a/jsprit-core/src/test/java/jsprit/core/problem/job/ServiceTest.java b/jsprit-core/src/test/java/jsprit/core/problem/job/ServiceTest.java
index 2e0fc837..ed1ccde7 100644
--- a/jsprit-core/src/test/java/jsprit/core/problem/job/ServiceTest.java
+++ b/jsprit-core/src/test/java/jsprit/core/problem/job/ServiceTest.java
@@ -28,7 +28,7 @@ import org.junit.Test;
 public class ServiceTest {
 	
 	@Test
-	public void whenTwoServicesHaveTheSameId_theyReferencesShouldBeUnEqual(){
+	public void whenTwoServicesHaveTheSameId_theirReferencesShouldBeUnEqual(){
 		Service one = Service.Builder.newInstance("service", 10).setLocationId("foo").build();
 		Service two = Service.Builder.newInstance("service", 10).setLocationId("fo").build();