diff --git a/src/path_calculator.rs b/src/path_calculator.rs
index 98e0115..5cf7101 100644
--- a/src/path_calculator.rs
+++ b/src/path_calculator.rs
@@ -29,6 +29,7 @@ use crate::heap_item::HeapItem;
 use crate::shortest_path::ShortestPath;
 use crate::valid_flags::ValidFlags;
 
+#[derive(Clone, Debug)]
 pub struct PathCalculator {
     num_nodes: usize,
     data_fwd: Vec<Data>,
@@ -375,6 +376,7 @@ impl PathCalculator {
     }
 }
 
+#[derive(Clone, Debug)]
 struct Data {
     settled: bool,
     weight: Weight,
diff --git a/src/preparation_graph.rs b/src/preparation_graph.rs
index fa82d60..3c6941a 100644
--- a/src/preparation_graph.rs
+++ b/src/preparation_graph.rs
@@ -154,7 +154,7 @@ impl PreparationGraph {
     }
 }
 
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct Arc {
     pub adj_node: NodeId,
     pub weight: Weight,
diff --git a/src/valid_flags.rs b/src/valid_flags.rs
index 1bb9fc6..2aadc79 100644
--- a/src/valid_flags.rs
+++ b/src/valid_flags.rs
@@ -23,6 +23,7 @@ use crate::constants::NodeId;
 
 /// Maintains a collection of N boolean flags that can efficiently be reset by incrementing a
 /// single integer
+#[derive(Clone, Debug)]
 pub struct ValidFlags {
     valid_flags: Vec<u32>,
     valid_flag: u32,