diff --git a/core/src/net/sf/openrocket/database/motor/ThrustCurveMotorSet.java b/core/src/net/sf/openrocket/database/motor/ThrustCurveMotorSet.java
index b48ed3344..edadd5f8f 100644
--- a/core/src/net/sf/openrocket/database/motor/ThrustCurveMotorSet.java
+++ b/core/src/net/sf/openrocket/database/motor/ThrustCurveMotorSet.java
@@ -220,6 +220,9 @@ public class ThrustCurveMotorSet implements Comparable<ThrustCurveMotorSet> {
 				(type != m.getMotorType())) {
 			return false;
 		}
+
+		if (!designation.equalsIgnoreCase(m.getDesignation()))
+			return false;
 		
 		if (!commonName.equalsIgnoreCase(m.getCommonName()))
 			return false;