diff --git a/include/gp-bnb/graph.hpp b/include/gp-bnb/graph.hpp
index ccab34fd4a0b486015979d56c22518503f9cc282..68fed41b2ff14af4ced46eaa6b1c73193588f72d 100644
--- a/include/gp-bnb/graph.hpp
+++ b/include/gp-bnb/graph.hpp
@@ -9,7 +9,6 @@ using vertex_id = unsigned int;
 class graph {
 public:    
 
-    graph() = default;
     /** @brief  Initializes the graph to be partitioned
      *  @param  Adjacency lists
      */