diff --git a/sigil/eclipse/ui/.project b/sigil/eclipse/ui/.project
index e736268..a8b1291 100644
--- a/sigil/eclipse/ui/.project
+++ b/sigil/eclipse/ui/.project
@@ -11,18 +11,13 @@
 			</arguments>
 		</buildCommand>
 		<buildCommand>
-			<name>org.eclipse.pde.ManifestBuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-		<buildCommand>
-			<name>org.eclipse.pde.SchemaBuilder</name>
+			<name>org.cauldron.sigil.core.newtonBuilder</name>
 			<arguments>
 			</arguments>
 		</buildCommand>
 	</buildSpec>
 	<natures>
-		<nature>org.eclipse.pde.PluginNature</nature>
 		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.cauldron.sigil.core.newtonnature</nature>
 	</natures>
 </projectDescription>