diff --git a/sigil/common/obr/.project b/sigil/common/obr/.project
index e4f71db..82ea9fa 100644
--- a/sigil/common/obr/.project
+++ b/sigil/common/obr/.project
@@ -11,12 +11,7 @@
 			</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>
@@ -24,5 +19,6 @@
 	<natures>
 		<nature>org.eclipse.pde.PluginNature</nature>
 		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.cauldron.sigil.core.newtonnature</nature>
 	</natures>
 </projectDescription>