diff --git a/swing/src/net/sf/openrocket/gui/dialogs/preferences/SimulationPreferencesPanel.java b/swing/src/net/sf/openrocket/gui/dialogs/preferences/SimulationPreferencesPanel.java
index b6f64cef3..88835fcdc 100644
--- a/swing/src/net/sf/openrocket/gui/dialogs/preferences/SimulationPreferencesPanel.java
+++ b/swing/src/net/sf/openrocket/gui/dialogs/preferences/SimulationPreferencesPanel.java
@@ -115,6 +115,7 @@ public class SimulationPreferencesPanel extends PreferencesPanel {
 				GeodeticComputationStrategy gcs = (GeodeticComputationStrategy) gcsCombo
 						.getSelectedItem();
 				gcsCombo.setToolTipText(gcs.getDescription());
+				gcsCombo.repaint(); // On some machines, the combobox did not visually update to the selected item
 			}
 		};
 		gcsCombo.addActionListener(gcsTTipListener);