diff --git a/core/src/net/sf/openrocket/preset/xml/MaterialDTO.java b/core/src/net/sf/openrocket/preset/xml/MaterialDTO.java
index 7ce9c468d..745dd8acb 100644
--- a/core/src/net/sf/openrocket/preset/xml/MaterialDTO.java
+++ b/core/src/net/sf/openrocket/preset/xml/MaterialDTO.java
@@ -45,7 +45,6 @@ public class MaterialDTO {
 		density = theDensity;
 		type = theType;
 		uom = theUom;
-		type.getORMaterialType().getUnitGroup().setDefaultUnit(getUom());
 	}
 
 	public String getName() {
@@ -70,7 +69,6 @@ public class MaterialDTO {
 
 	public void setType(final MaterialTypeDTO theType) {
 		type = theType;
-		type.getORMaterialType().getUnitGroup().setDefaultUnit(getUom());
 	}
 
 	public String getUom() {
@@ -79,7 +77,6 @@ public class MaterialDTO {
 
 	public void setUom(final String theUom) {
 		uom = theUom;
-		type.getORMaterialType().getUnitGroup().setDefaultUnit(theUom);
 	}
 
 	Material asMaterial() {
@@ -104,7 +101,6 @@ public class MaterialDTO {
 				// in SI units, so we need to convert it to SI units
 				Unit uomUnit = type.getORMaterialType().getUnitGroup().getUnit(getUom());
 				density = uomUnit.fromUnit(density);
-				//type.getORMaterialType().getUnitGroup().setDefaultUnit(uomUnit);
 			}
 		}
 	}