diff --git a/log4j-core/src/main/java/org/apache/logging/log4j/core/layout/Rfc5424Layout.java b/log4j-core/src/main/java/org/apache/logging/log4j/core/layout/Rfc5424Layout.java
index 7e48f08..aae47ea 100644
--- a/log4j-core/src/main/java/org/apache/logging/log4j/core/layout/Rfc5424Layout.java
+++ b/log4j-core/src/main/java/org/apache/logging/log4j/core/layout/Rfc5424Layout.java
@@ -55,7 +55,7 @@
 import org.apache.logging.log4j.message.StructuredDataCollectionMessage;
 import org.apache.logging.log4j.message.StructuredDataId;
 import org.apache.logging.log4j.message.StructuredDataMessage;
-import org.apache.logging.log4j.util.ProcessIdUtil;
+import org.apache.logging.log4j.core.util.ProcessIdUtil;
 import org.apache.logging.log4j.util.StringBuilders;
 import org.apache.logging.log4j.util.Strings;
 
diff --git a/log4j-core/src/main/java/org/apache/logging/log4j/core/pattern/ProcessIdPatternConverter.java b/log4j-core/src/main/java/org/apache/logging/log4j/core/pattern/ProcessIdPatternConverter.java
index d3d8bc4..4d73cdc 100644
--- a/log4j-core/src/main/java/org/apache/logging/log4j/core/pattern/ProcessIdPatternConverter.java
+++ b/log4j-core/src/main/java/org/apache/logging/log4j/core/pattern/ProcessIdPatternConverter.java
@@ -18,7 +18,7 @@
 
 import org.apache.logging.log4j.core.LogEvent;
 import org.apache.logging.log4j.plugins.Plugin;
-import org.apache.logging.log4j.util.ProcessIdUtil;
+import org.apache.logging.log4j.core.util.ProcessIdUtil;
 
 @Plugin(name = "ProcessIdPatternConverter", category = "Converter")
 @ConverterKeys({ "pid", "processId" })
diff --git a/log4j-core/src/main/java/org/apache/logging/log4j/util/ProcessIdUtil.java b/log4j-core/src/main/java/org/apache/logging/log4j/core/util/ProcessIdUtil.java
similarity index 97%
rename from log4j-core/src/main/java/org/apache/logging/log4j/util/ProcessIdUtil.java
rename to log4j-core/src/main/java/org/apache/logging/log4j/core/util/ProcessIdUtil.java
index 685aabe..2579350 100644
--- a/log4j-core/src/main/java/org/apache/logging/log4j/util/ProcessIdUtil.java
+++ b/log4j-core/src/main/java/org/apache/logging/log4j/core/util/ProcessIdUtil.java
@@ -14,7 +14,7 @@
  * See the license for the specific language governing permissions and
  * limitations under the license.
  */
-package org.apache.logging.log4j.util;
+package org.apache.logging.log4j.core.util;
 
 import java.io.File;
 import java.io.IOException;
diff --git a/log4j-core/src/test/java/org/apache/logging/log4j/core/layout/Rfc5424LayoutTest.java b/log4j-core/src/test/java/org/apache/logging/log4j/core/layout/Rfc5424LayoutTest.java
index 1987c44..4d900a1 100644
--- a/log4j-core/src/test/java/org/apache/logging/log4j/core/layout/Rfc5424LayoutTest.java
+++ b/log4j-core/src/test/java/org/apache/logging/log4j/core/layout/Rfc5424LayoutTest.java
@@ -36,7 +36,7 @@
 import org.apache.logging.log4j.message.StructuredDataMessage;
 import org.apache.logging.log4j.status.StatusLogger;
 import org.apache.logging.log4j.test.appender.ListAppender;
-import org.apache.logging.log4j.util.ProcessIdUtil;
+import org.apache.logging.log4j.core.util.ProcessIdUtil;
 import org.apache.logging.log4j.util.Strings;
 import org.junit.AfterClass;
 import org.junit.Assert;
diff --git a/log4j-core/src/test/java/org/apache/logging/log4j/util/ProcessIdUtilTest.java b/log4j-core/src/test/java/org/apache/logging/log4j/core/util/ProcessIdUtilTest.java
similarity index 91%
rename from log4j-core/src/test/java/org/apache/logging/log4j/util/ProcessIdUtilTest.java
rename to log4j-core/src/test/java/org/apache/logging/log4j/core/util/ProcessIdUtilTest.java
index 13aaf9c..44cee0a 100644
--- a/log4j-core/src/test/java/org/apache/logging/log4j/util/ProcessIdUtilTest.java
+++ b/log4j-core/src/test/java/org/apache/logging/log4j/core/util/ProcessIdUtilTest.java
@@ -14,8 +14,9 @@
  * See the license for the specific language governing permissions and
  * limitations under the license.
  */
-package org.apache.logging.log4j.util;
+package org.apache.logging.log4j.core.util;
 
+import org.apache.logging.log4j.core.util.ProcessIdUtil;
 import org.junit.Test;
 
 import static org.junit.Assert.*;