Index: applications/editors/josm/plugins/utilsplugin2/src/org/openstreetmap/josm/plugins/utilsplugin2/curves/CircleArcMaker.java
===================================================================
--- applications/editors/josm/plugins/utilsplugin2/src/org/openstreetmap/josm/plugins/utilsplugin2/curves/CircleArcMaker.java	(revision 35432)
+++ applications/editors/josm/plugins/utilsplugin2/src/org/openstreetmap/josm/plugins/utilsplugin2/curves/CircleArcMaker.java	(revision 35434)
@@ -23,4 +23,5 @@
 import org.openstreetmap.josm.data.osm.DataSet;
 import org.openstreetmap.josm.data.osm.Node;
+import org.openstreetmap.josm.data.osm.Relation;
 import org.openstreetmap.josm.data.osm.Way;
 import org.openstreetmap.josm.data.projection.ProjectionRegistry;
@@ -134,7 +135,9 @@
 
         Set<Node> fixNodes = new HashSet<>(anchorNodes);
-        if (!selectedWays.isEmpty()) {
-            nodes.stream().filter(n -> n.getParentWays().size() > 1 || n.isTagged()).forEach(fixNodes::add);
-        }
+		if (!selectedWays.isEmpty()) {
+			nodes.stream().filter(
+					n -> n.isTagged() || n.getParentWays().size() > 1 || n.referrers(Relation.class).count() > 0)
+					.forEach(fixNodes::add);
+		}
         boolean needsUndo = false;
         if (!cmds.isEmpty()) {