diff --git a/core/src/net/sf/openrocket/masscalc/MassCalculation.java b/core/src/net/sf/openrocket/masscalc/MassCalculation.java
index c72aa5e44..7a4ce4f78 100644
--- a/core/src/net/sf/openrocket/masscalc/MassCalculation.java
+++ b/core/src/net/sf/openrocket/masscalc/MassCalculation.java
@@ -66,7 +66,7 @@ public class MassCalculation {
 	}
 	
 	public void addMass( final Coordinate pointMass ) {
-		if( MIN_MASS < this.centerOfMass.weight ){
+		if( MIN_MASS > this.centerOfMass.weight ){
 		    this.centerOfMass = pointMass;
 		}else {
 			this.centerOfMass = this.centerOfMass.average( pointMass);