diff --git a/swing/src/net/sf/openrocket/gui/configdialog/ComponentAssemblyConfig.java b/swing/src/net/sf/openrocket/gui/configdialog/ComponentAssemblyConfig.java
index 55d23e283..1bca9bfd7 100644
--- a/swing/src/net/sf/openrocket/gui/configdialog/ComponentAssemblyConfig.java
+++ b/swing/src/net/sf/openrocket/gui/configdialog/ComponentAssemblyConfig.java
@@ -32,7 +32,7 @@ public class ComponentAssemblyConfig extends RocketComponentConfig {
 		super(document, component);
 	
 		// only stages which are actually off-centerline will get the dialog here:
-		if( component.getClass().isAssignableFrom( ParallelStage.class) || component.getClass().isAssignableFrom( PodSet.class)){
+		if( ParallelStage.class.isAssignableFrom( component.getClass()) || PodSet.class.isAssignableFrom( component.getClass())){
 			tabbedPane.insertTab( trans.get("RocketCompCfg.tab.Assembly"), null, parallelTab( (ComponentAssembly)component ), trans.get("RocketCompCfg.tab.AssemblyComment"), 0);
 			tabbedPane.setSelectedIndex(0);
 		}