diff --git a/core/src/net/sf/openrocket/document/OpenRocketDocument.java b/core/src/net/sf/openrocket/document/OpenRocketDocument.java
index fdf88c742..c479005b9 100644
--- a/core/src/net/sf/openrocket/document/OpenRocketDocument.java
+++ b/core/src/net/sf/openrocket/document/OpenRocketDocument.java
@@ -287,7 +287,7 @@ public class OpenRocketDocument implements ComponentChangeListener {
 		}
 		for (Simulation s : getSimulations()) {
 			// Assumes modifiable collection - which it is
-			if (s.getConfiguration().getFlightConfigurationID().equals(configId)) {
+			if (configId.equals(s.getConfiguration().getFlightConfigurationID())) {
 				removeSimulation(s);
 			}
 		}