diff --git a/swing/src/net/sf/openrocket/gui/main/DesignPanel.java b/swing/src/net/sf/openrocket/gui/main/DesignPanel.java
index 900ecfcc6..9795207e7 100644
--- a/swing/src/net/sf/openrocket/gui/main/DesignPanel.java
+++ b/swing/src/net/sf/openrocket/gui/main/DesignPanel.java
@@ -179,7 +179,7 @@ public class DesignPanel extends JSplitPane {
 
         // Place tree inside scroll pane
         JScrollPane scroll = new JScrollPane(tree);
-        panel.add(scroll, "spany, grow, wrap");
+        panel.add(scroll, "spany, wmin 140px, grow, wrap");
 
 
         // Buttons