diff --git a/modules/core/src/main/java/org/locationtech/jts/operation/relateng/EdgeSegmentIntersector.java b/modules/core/src/main/java/org/locationtech/jts/operation/relateng/EdgeSegmentIntersector.java
index d1c2d4af3..bb873e0a3 100644
--- a/modules/core/src/main/java/org/locationtech/jts/operation/relateng/EdgeSegmentIntersector.java
+++ b/modules/core/src/main/java/org/locationtech/jts/operation/relateng/EdgeSegmentIntersector.java
@@ -17,7 +17,7 @@
 import org.locationtech.jts.noding.SegmentString;
 import org.locationtech.jts.noding.SegmentStringUtil;
 
-public class EdgeSegmentIntersector implements SegmentIntersector 
+class EdgeSegmentIntersector implements SegmentIntersector 
 {
   private RobustLineIntersector li = new RobustLineIntersector();
   private TopologyBuilder topoBuilder;
diff --git a/modules/core/src/main/java/org/locationtech/jts/operation/relateng/EdgeSegmentOverlapAction.java b/modules/core/src/main/java/org/locationtech/jts/operation/relateng/EdgeSegmentOverlapAction.java
index a855eace9..7a44fd979 100644
--- a/modules/core/src/main/java/org/locationtech/jts/operation/relateng/EdgeSegmentOverlapAction.java
+++ b/modules/core/src/main/java/org/locationtech/jts/operation/relateng/EdgeSegmentOverlapAction.java
@@ -16,7 +16,7 @@
 import org.locationtech.jts.noding.SegmentIntersector;
 import org.locationtech.jts.noding.SegmentString;
 
-public class EdgeSegmentOverlapAction
+class EdgeSegmentOverlapAction
     extends MonotoneChainOverlapAction
 {
   private SegmentIntersector si = null;
diff --git a/modules/core/src/main/java/org/locationtech/jts/operation/relateng/EdgeSetIntersector.java b/modules/core/src/main/java/org/locationtech/jts/operation/relateng/EdgeSetIntersector.java
index 12b22dc24..3538c6339 100644
--- a/modules/core/src/main/java/org/locationtech/jts/operation/relateng/EdgeSetIntersector.java
+++ b/modules/core/src/main/java/org/locationtech/jts/operation/relateng/EdgeSetIntersector.java
@@ -23,7 +23,7 @@
 import org.locationtech.jts.index.hprtree.HPRtree;
 import org.locationtech.jts.noding.SegmentString;
 
-public class EdgeSetIntersector {
+class EdgeSetIntersector {
 
   private HPRtree index = new HPRtree();
   private Envelope envelope;
diff --git a/modules/core/src/main/java/org/locationtech/jts/operation/relateng/EdgeSetMutualIntersector.java b/modules/core/src/main/java/org/locationtech/jts/operation/relateng/EdgeSetMutualIntersector.java
index 61c048a06..d5b06423d 100644
--- a/modules/core/src/main/java/org/locationtech/jts/operation/relateng/EdgeSetMutualIntersector.java
+++ b/modules/core/src/main/java/org/locationtech/jts/operation/relateng/EdgeSetMutualIntersector.java
@@ -34,7 +34,7 @@
  * 
  * @version 1.7
  */
-public class EdgeSetMutualIntersector implements SegmentSetMutualIntersector
+class EdgeSetMutualIntersector implements SegmentSetMutualIntersector
 {
   private HPRtree index = new HPRtree();
   private Envelope envelope;
diff --git a/modules/core/src/main/java/org/locationtech/jts/operation/relateng/LinearBoundary.java b/modules/core/src/main/java/org/locationtech/jts/operation/relateng/LinearBoundary.java
index 7eafbbaa5..632fc8987 100644
--- a/modules/core/src/main/java/org/locationtech/jts/operation/relateng/LinearBoundary.java
+++ b/modules/core/src/main/java/org/locationtech/jts/operation/relateng/LinearBoundary.java
@@ -20,7 +20,7 @@
 import org.locationtech.jts.geom.Geometry;
 import org.locationtech.jts.geom.LineString;
 
-public class LinearBoundary {
+class LinearBoundary {
 
   //TODO: handle BoundaryNodeRule
   
diff --git a/modules/core/src/main/java/org/locationtech/jts/operation/relateng/RelateGeometry.java b/modules/core/src/main/java/org/locationtech/jts/operation/relateng/RelateGeometry.java
index b7816d878..8f69624d6 100644
--- a/modules/core/src/main/java/org/locationtech/jts/operation/relateng/RelateGeometry.java
+++ b/modules/core/src/main/java/org/locationtech/jts/operation/relateng/RelateGeometry.java
@@ -39,7 +39,7 @@
 import org.locationtech.jts.noding.BasicSegmentString;
 import org.locationtech.jts.noding.SegmentString;
 
-public class RelateGeometry {
+class RelateGeometry {
 
   public static final boolean GEOM_A = true;
   public static final boolean GEOM_B = false;
diff --git a/modules/core/src/main/java/org/locationtech/jts/operation/relateng/TopologyBuilder.java b/modules/core/src/main/java/org/locationtech/jts/operation/relateng/TopologyBuilder.java
index 5f43c25ea..e01dbaaed 100644
--- a/modules/core/src/main/java/org/locationtech/jts/operation/relateng/TopologyBuilder.java
+++ b/modules/core/src/main/java/org/locationtech/jts/operation/relateng/TopologyBuilder.java
@@ -21,7 +21,7 @@
 import org.locationtech.jts.geom.Position;
 import org.locationtech.jts.util.Assert;
 
-public class TopologyBuilder {
+class TopologyBuilder {
 
   private static final String MSG_GEOMETRY_DIMENSION_UNEXPECTED = "Unexpected combination of geometry dimensions";
 
diff --git a/modules/core/src/main/java/org/locationtech/jts/operation/relateng/TopologyPredicateValue.java b/modules/core/src/main/java/org/locationtech/jts/operation/relateng/TopologyPredicateValue.java
index 28a3bbef5..88fe2b5e2 100644
--- a/modules/core/src/main/java/org/locationtech/jts/operation/relateng/TopologyPredicateValue.java
+++ b/modules/core/src/main/java/org/locationtech/jts/operation/relateng/TopologyPredicateValue.java
@@ -11,7 +11,7 @@
  */
 package org.locationtech.jts.operation.relateng;
 
-public class TopologyPredicateValue {
+class TopologyPredicateValue {
 
   public static final int UNKNOWN = -1;
   public static final int FALSE = 0;