diff --git a/src/main/java/eu/gaiax/sdcreationwizard/api/ConversionService.java b/src/main/java/eu/gaiax/sdcreationwizard/api/ConversionService.java
index fd07051e8c411b28205a807eed7e3a36aa629d47..37e110c68256a668e18995f4f60b2c79574e18c7 100644
--- a/src/main/java/eu/gaiax/sdcreationwizard/api/ConversionService.java
+++ b/src/main/java/eu/gaiax/sdcreationwizard/api/ConversionService.java
@@ -63,7 +63,7 @@ public class ConversionService {
         return new ShaclModel(prefixList, shapesSorted);
     }
 
-    public static int calculateDepth(VicShape shape, List<VicShape> shapes, Map<VicShape, Integer> visitedShapes) {
+    private static int calculateDepth(VicShape shape, List<VicShape> shapes, Map<VicShape, Integer> visitedShapes) {
         if (visitedShapes.containsKey(shape)) {
             return visitedShapes.get(shape);
         }