diff --git a/wot-dijkstra/src/main/kotlin/org/pgpainless/wot/dijkstra/sq/Depth.kt b/wot-dijkstra/src/main/kotlin/org/pgpainless/wot/dijkstra/sq/Depth.kt
index 9e43c0ad..bfce1e55 100644
--- a/wot-dijkstra/src/main/kotlin/org/pgpainless/wot/dijkstra/sq/Depth.kt
+++ b/wot-dijkstra/src/main/kotlin/org/pgpainless/wot/dijkstra/sq/Depth.kt
@@ -7,7 +7,7 @@ package org.pgpainless.wot.dijkstra.sq
 /**
  * Depth of a trust signature.
  */
-class Depth(val limit: Int?) : Comparable<Depth> {
+class Depth private constructor(val limit: Int?) : Comparable<Depth> {
 
     companion object {
         /**