diff --git a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/DefaultIsisController.java b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/DefaultIsisController.java
index 60bb531..9cafc4c 100644
--- a/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/DefaultIsisController.java
+++ b/protocols/isis/ctl/src/main/java/org/onosproject/isis/controller/impl/DefaultIsisController.java
@@ -45,7 +45,7 @@
 @Service
 public class DefaultIsisController implements IsisController {
 
-    protected static final Logger log = LoggerFactory.getLogger(DefaultIsisController.class);
+    private static final Logger log = LoggerFactory.getLogger(DefaultIsisController.class);
     private final Controller controller = new Controller();
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected DriverService driverService;
diff --git a/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/isispacket/IsisMessageReader.java b/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/isispacket/IsisMessageReader.java
index c21fd3b..c1d5f81 100644
--- a/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/isispacket/IsisMessageReader.java
+++ b/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/isispacket/IsisMessageReader.java
@@ -33,7 +33,7 @@
  */
 public class IsisMessageReader {
 
-    protected static final Logger log = LoggerFactory.getLogger(IsisMessageReader.class);
+    private static final Logger log = LoggerFactory.getLogger(IsisMessageReader.class);
 
     /**
      * Reads from ISIS packet from buffer.
diff --git a/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/isispacket/tlv/TlvsToBytes.java b/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/isispacket/tlv/TlvsToBytes.java
index 66b3292..659ef57 100644
--- a/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/isispacket/tlv/TlvsToBytes.java
+++ b/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/isispacket/tlv/TlvsToBytes.java
@@ -27,7 +27,7 @@
  */
 public final class TlvsToBytes {
 
-    protected static final Logger log = LoggerFactory.getLogger(TlvsToBytes.class);
+    private static final Logger log = LoggerFactory.getLogger(TlvsToBytes.class);
 
     /**
      * Creates an instance.
diff --git a/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/isispacket/tlv/subtlv/SubTlvToBytes.java b/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/isispacket/tlv/subtlv/SubTlvToBytes.java
index d052bfc..a7bb08f 100644
--- a/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/isispacket/tlv/subtlv/SubTlvToBytes.java
+++ b/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/isispacket/tlv/subtlv/SubTlvToBytes.java
@@ -27,7 +27,7 @@
  */
 public final class SubTlvToBytes {
 
-    protected static final Logger log = LoggerFactory.getLogger(SubTlvToBytes.class);
+    private static final Logger log = LoggerFactory.getLogger(SubTlvToBytes.class);
 
     /**
      * Creates an instance.