diff --git a/core/src/net/sf/openrocket/document/Simulation.java b/core/src/net/sf/openrocket/document/Simulation.java
index 30b4d02c7..8afdbde59 100644
--- a/core/src/net/sf/openrocket/document/Simulation.java
+++ b/core/src/net/sf/openrocket/document/Simulation.java
@@ -497,6 +497,7 @@ public class Simulation implements ChangeSource, Cloneable {
 			Simulation copy = new Simulation(newRocket);
 			
 			copy.name = this.name;
+			copy.configId = this.configId;
 			copy.options.copyFrom(this.options);
 			copy.simulatedConfigurationDescription = this.simulatedConfigurationDescription;
 			for (SimulationExtension c : this.simulationExtensions) {