diff --git a/spring-cloud-config-server/src/test/java/org/springframework/cloud/config/server/ssh/PropertyBasedSshSessionFactoryTest.java b/spring-cloud-config-server/src/test/java/org/springframework/cloud/config/server/ssh/PropertyBasedSshSessionFactoryTest.java
index 8e614e5e..3528b52a 100644
--- a/spring-cloud-config-server/src/test/java/org/springframework/cloud/config/server/ssh/PropertyBasedSshSessionFactoryTest.java
+++ b/spring-cloud-config-server/src/test/java/org/springframework/cloud/config/server/ssh/PropertyBasedSshSessionFactoryTest.java
@@ -38,6 +38,7 @@ import com.jcraft.jsch.JSch;
 import com.jcraft.jsch.Session;
 import com.jcraft.jsch.UserInfo;
 
+import static org.mockito.Matchers.isNull;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.verifyNoMoreInteractions;
 import static org.mockito.Mockito.when;