diff --git a/daemon/table/cs.hpp b/daemon/table/cs.hpp
index e4c1ae6..aeaec38 100644
--- a/daemon/table/cs.hpp
+++ b/daemon/table/cs.hpp
@@ -85,7 +85,7 @@
    *  Reference: "Skip Lists: A Probabilistic Alternative to Balanced Trees" by W.Pugh
    *  \return{ returns random layer (number) in a skip list}
    */
-  int
+  size_t
   pickRandomLayer() const;
 
   /** \brief Inserts a new Content Store Entry in a skip list