diff --git a/src/dev/graph.rs b/src/dev/graph.rs
index d3682eb2..0bc69a5e 100644
--- a/src/dev/graph.rs
+++ b/src/dev/graph.rs
@@ -21,8 +21,7 @@ pub fn circuit_dot_graph<F: Field, ConcreteCircuit: Circuit<F>>(
     let mut cs = ConstraintSystem::default();
     let config = ConcreteCircuit::configure(&mut cs);
     let mut graph = Graph::default();
-    ConcreteCircuit::FloorPlanner::synthesize(&mut graph, circuit, config, cs.constants.clone())
-        .unwrap();
+    ConcreteCircuit::FloorPlanner::synthesize(&mut graph, circuit, config, cs.constants).unwrap();
 
     // Construct the node labels. We need to store these, because tabbycat operates on
     // string references, and we need those references to live long enough.