diff --git a/build/org.eclipse.cdt.managedbuilder.core/schema/buildDefinitions.exsd b/build/org.eclipse.cdt.managedbuilder.core/schema/buildDefinitions.exsd
index dc291b7f7b8..5564836249e 100644
--- a/build/org.eclipse.cdt.managedbuilder.core/schema/buildDefinitions.exsd
+++ b/build/org.eclipse.cdt.managedbuilder.core/schema/buildDefinitions.exsd
@@ -128,6 +128,13 @@
                </appInfo>
             </annotation>
          </attribute>
+         <attribute name="convertToId" type="string">
+            <annotation>
+               <documentation>
+                  The identifier of a projectType, that project types loaded using this definition should be converted to. MBS will invoke a proper converter.
+               </documentation>
+            </annotation>
+         </attribute>
       </complexType>
    </element>