diff --git a/swing/src/net/sf/openrocket/gui/plot/SimulationPlot.java b/swing/src/net/sf/openrocket/gui/plot/SimulationPlot.java
index 5d866dabc..9900305b4 100644
--- a/swing/src/net/sf/openrocket/gui/plot/SimulationPlot.java
+++ b/swing/src/net/sf/openrocket/gui/plot/SimulationPlot.java
@@ -427,7 +427,8 @@ public class SimulationPlot {
 
 		// Plot the markers
 		if (config.getDomainAxisType() == FlightDataType.TYPE_TIME) {
-			double markerWidth = 0.7;
+			double markerWidth = 0.01 * plot.getDomainAxis().getUpperBound();
+
 			// Domain time is plotted as vertical markers
 			for (int i = 0; i < eventTimes.size(); i++) {
 				double t = eventTimes.get(i);